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CHAPTER
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The Skeletal System:
The Framework
6
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I. Introduction
A. Function
1. The skeletal system provides support and allows us to move.
2. Protects the soft body parts, produces blood cells, and acts as a storage unit for minerals and fat.
3. There are 206 bones in the adult skeleton, along with cartilage, ligaments, and joints.
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II. Bones
A. Although bones are composed of non-living minerals such as calcium and phosphorous, they are very much alive.
B. The word ‘skeleton’ comes from the Greek meaning “dried up body.”
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C. Classified according to their shape:
1. Long bones – These bones are longer than they are wide and can be found in the arms and legs.
2. Short bones – These bones are fairly equal in width and length and are found mostly in the wrists and ankles.
3. Flat bones – These bones are thinner and can be either flat or curved (skull, ribs, and sternum).
4. Irregular bones – These bones are like parts of a jigsaw puzzle, odd in shape, and include the hip bone and vertebrae.
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Figure 6-1 Various bone shapes.
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D. Basic Bone Anatomy
1. Periosteum
a. Is an outer covering that is comprised of tough, fibrous connective tissue
b. Contains blood vessels, lymph vessels, and nerves
c. The periosteum acts as an anchor point for ligaments and tendons.
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2. Epiphysis and Diaphysis
a. Both ends of a long bone increase in size to form the epiphysis
b. The region running between the two epiphyses is called the diaphysis.
c. The diaphysis is hollow (called the medullary cavity). It acts as a storage area for the yellow marrow.
i. Red marrow makes red blood cells
ii. Yellow marrow has a high fat content and can convert to red marrow in an emergency.
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Figure 6-2 Basic bone anatomy.
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E. Bone tissue
Bone can be composed of two types of tissue:
1. Compact
– Dense, hard tissue normally composing the shafts of long bones and the outer layer of other bones.
a. Mature bone cells form concentric circles around blood vessels.
b. The area around the bone cells is filled with bone matrix.
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2. Spongy
a. Spongy bone is arranged in bars and plates (called trabeculae).
b. Irregular holes give the bone a spongy appearance and make the bone lighter in weight.
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Figure 6-3 Comparison of compact and spongy bone.
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Figure 6-3 Comparison of compact and spongy bone.
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F. Surface structure of bones
1. Bone is not perfectly smooth.
2. Projections act as points of attachment for muscles, ligaments, or tendons.
3. Grooves and depressions act as pathways for nerves and blood vessels.
4. Projecting structures and depressions can work together as joining or articulation points to form joints such as the ball and socket joint in your hip.
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G. Bone growth and repair
1. Ossification is the term used to describe the formation of bone in the body.
2. Types of cells involved in bone formation and growth:
Osteoprogenitor cells
Osteoblasts
Osteocytes
Osteoclasts
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Osteoblasts
• Osteoblasts are the cells that actually form bones.
• They arise from the non-specialized osteoprogenitor cells and are the cells that secrete the matrix of calcium with other minerals that give bone its typical characteristics.
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Osteoclasts
• The osteoclasts’ job is to tear down bone material and help move calcium and phosphate into the blood.
• It is believed that osteoclasts originate from a type of white blood cell called a monocyte that is found in red bone marrow.
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3. Bone development and growth – bone development begins when you are an embryo through ossification
4. Bone repair – for a bone fracture to heal, the ends of broken bone must be touching. A four stage procedure then follows:
a. Hematoma forms; inflammation
b. Soft callus forms (cartilage). Cartilage fills in the space between the bones.
c. Bony callus forms. Bone replaces the cartilage.
d. The bone is remodeled via the activity of osteoblasts and osteoclasts until the fracture is nearly undetectable.
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Figure 6-4 Endochondral ossification of long bone.
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III. Cartilage
A. Cells called chondrocytes.
B. Chondrocytes exist in holes in a gel-like matrix.
C. Location and functions1. The flexible part of your nose and ears are cartilage.2. Makes a flexible connection between bones, as between the ribs and sternum, allowing chest flexion during deep breathing3. Cartilage acts as a cushion between bones; articular cartilage is located on the ends of bones and acts as a shock absorber, preventing the ends from grinding together during movement..
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Figure 6-5 Articular cartilage and synovial joint.
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IV. Joints and Ligaments
A. When two or more bones join together, an articulation or joint is formed.
B. Many joints must be held together, yet still be movable, which is accomplished by special connective tissue called ligaments.
C. Tendons are cord-like structures that attach muscle to bone.
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D. Joints can be classified by function or structure:
1. Function
a. Immobile
b. Move a little
c. Move freely
2. Structure
a. Fibrous: bones jointed by short connective tissue strands
b. Cartilaginous: bones united by cartilage
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c. Synovial: bones united by fluid filled joint cavity
i. Pivot joint – turnstile movement in the neck and forearm
ii. Ball-and-socket joint – hip and shoulder
iii. Hinge joint – allow up and down movement in the knees and elbows
iv. Gliding joint – wrists and ankles
v. Saddle joint – shaped like a saddle found in the thumb
vi. Ellipsoidal joint – oval-shaped bone end fitting into an elliptical cavity in the other bone so there is movement from one plane to another but no rotation – fingers and toes
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Figure 6-6 Types of joints.
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E. Movement classification
1. Flexion – decreasing the angle of a joint
2. Extension – increasing the angle of a joint
3. Plantar flexion – pointing toes down
4. Dorsiflexion – bending the food up toward the body
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5. Abduction – moving away from the body’s midline
6. Adduction – moving toward the midline of the body
7. Inversion – turning the foot inward toward other foot
8. Eversion – turning the foot outward away from opposing foot
9. Circumduction – circular arm movement
Movement classification cont.
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Figure 6-7 Classification of joint movements.
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V. Bones of the SkeletonA. Two main sections of the skeleton
1. Axial skeleton – Bones of the bony thorax, spinal column, hyoid bone, bones of the middle ear, and skull; they protect the body organs and total 80 bones
a. The skull – many bones forming a brain case and facial structures
b. The thorax – ribs and sternum (protects thoracic cavity)
c. The Spinal Columni. Also called vertebral column; houses the spinal cord; the
superhighway for information coming to and from the central nervous system
ii. The individual bones or vertebrae are numbered and classified according to the body region where they’re located
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Figure 6-9 Bones of the skull.
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Figure 6-9 (continued) Bones of the skull.
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Figure 6-10 The bony thorax.
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Figure 6-11 The spinal column.
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V. Bones of the Skeleton
2. Appendicular skeleton – Bones of your arms, legs, hips, and shoulders and total 126 bones.
a. The appendicular region consists of the arms and legs.
b. Half the bones in the body are located in the hands and feet.
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Figure 6-13 Bones of the upper and lower extremities.
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VI. Common Disorders of the
Skeletal System
A. Aging affects the cartilage and bones. While this is a natural process, in some cases we can slow things down.
1. The composition of cartilage changes as we age, becoming more brittle and yellow due to calcification. This can lead to arthritis, an inflammatory process of the joints, reducing flexibility and decreasing range of motion.
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There are two main types of arthritis:
1.Osteoarthritis:– degenerative condition
– result of simple “wearing out” of a joint from a sports injury, trauma, repetitive motion, obesity, or just the aging process.
2.Rheumatoid arthritis: – Autoimmune disease
– Result of your body’s cells mistaking your own proteins as a foreign intruder.
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Osteoarthritis Rheumatoid
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2. Bone mass decreases with age. In our 50’s the breakdown of bone is greater.
a. Osteoporosis: light, weak, porous bones. More common in women, but can be diagnosed in men.
b. Treatment and prevention of osteoporosis:
i. Healthy lifestyle
ii. Proper calcium intake
iii. Proper vitamin D,
iv. Weight bearing exercise
v. Drink less caffeine
vi. Quitting smoking
vii. Medication (treatment)
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B. Bone fractures
1. A hairline fracture looks like a piece of hair on the x-ray. It is a fine fracture that doesn‘tcompletely break or displace the bone.
2. A simple or closed fracture is a break with minimal displacement and no tear in the skin.
3. A greenstick fracture is an incomplete break and is often found in children.
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4. A spiral fracture is caused by a twistingmotion to the bone.
5. A comminuted fracture occurs when the bone fragments or splinters.
6. A compound or open fracture occurs when the bone protrudes through the skin, with the potential of infection from exposure.
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Figure 6-14 (A) Femur, AP view, comminuted fracture.
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Figure 6-14 (continued) (B) Tibia, simple, transverse fracture.
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Figure 6-14 (continued) (C) Open fracture of the wrist.
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Figure 6-14 (continued) (D) Displaced fracture of the distal radius. (Source: Charles
Stewart & Associates.)
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Figure 6-14 (continued) (E) X-ray of complete fracture of the radius. (Source: James
Stevenson/Science Photo Library/Photo Researchers, Inc.)
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Figure 6-14 (continued) (F) Fractured humerus. (Source: Charles Stewart & Associates.)
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Figure 6-5 Articular cartilage and synovial joint.
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Figure 6-3 Comparison of compact and spongy bone.
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Figure 6-9 (continued) Bones of the skull.
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Figure 6-8 The anterior and posterior human skeleton.
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Test Your Knowledge (p. 124)
1. A term that can be used to describe the formation of bone is:
a. Ossification
b. Periosteum
c. Bonafide
d. Osteoclasts
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Test Your Knowledge (p. 124)
1. A term that can be used to describe the formation of bone is:
a. Ossification
b. Periosteum
c. Bonafide
d. Osteoclasts
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Test Your Knowledge (p. 124)
2. These cells actually form bones:
a. Osteoclasts
b. Pericytes
c. Generator cells
d. Osteoblasts
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Test Your Knowledge (p. 124)
2. These cells actually form bones:
a. Osteoclasts
b. Pericytes
c. Generator cells
d. Osteoblasts
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Test Your Knowledge (p. 124)
3. Another name for the “growth plate” is:
a. Tectonic plate
b. Epiphyseal plate
c. Upper plate
d. Periostium plate
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3. Another name for the “growth plate” is:
a. Tectonic plate
b. Epiphyseal plate
c. Upper plate
d. Periostium plate
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Test Your Knowledge (p. 124)
4. This connective tissue forms a cushion in joints:
a. Tendons
b. Ligaments
c. Cartilage
d. Cartridge
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Test Your Knowledge (p. 124)
4. This connective tissue forms a cushion in joints:
a. Tendons
b. Ligaments
c. Cartilage
d. Cartridge
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Test Your Knowledge (p. 124)
5. A skeleton is found buried in a land fill. Examination shows that the epiphysial plates are completely calcified. What was the age of the skeleton at time of death?
a. 5 years
b. 10 years
c. 15 years
d. 25 years
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Test Your Knowledge (p. 124)
5. A skeleton is found buried in a land fill. Examination shows that the epiphysial plates are completely calcified. What was the age of the skeleton at time of death?
a. 5 years
b. 10 years
c. 15 years
d. 25 years
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Test Your Knowledge (p. 124)
6. Riding his ATV one day, Jim falls and shatters his tibia, breaking it into many small pieces. At the hospital the surgeons use pins, plates, and screws to put pieces back in the right places. Why?
a. Bone must be touching to repair itself.
b. Bone cannot repair itself.
c. Inflammation is reduced by surgery.
d. The bone will never be strong enough to support weight after injury.
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Test Your Knowledge (p. 124)
6. Riding his ATV one day, Jim falls and shatters his tibia, breaking it into many small pieces. At the hospital the surgeons use pins, plates, and screws to put pieces back in the right places. Why?
a. Bone must be touching to repair itself.
b. Bone cannot repair itself.
c. Inflammation is reduced by surgery.
d. The bone will never be strong enough to support weight after injury.
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Test Your Knowledge (p. 128)
1. A movement that increases the angle of a joint is known as:
a. Flexion
b. Abduction
c. Rotation
d. Extension
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Test Your Knowledge (p. 128)
1. A movement that increases the angle of a joint is known as:
a. Flexion
b. Abduction
c. Rotation
d. Extension
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Test Your Knowledge (p. 128)
2. A joint in which bones are connected by short connective tissue strands is known as a
a. Cartilaginous joint
b. Fibrous joint
c. Synovial joint
d. Freely moving joint
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Test Your Knowledge (p. 128)
2. A joint in which bones are connected by short connective tissue strands is known as a
a. Cartilaginous joint
b. Fibrous joint
c. Synovial joint
d. Freely moving joint
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Test Your Knowledge (p. 128)
3. A joint in which flat bone surfaces move side to side past each other is known as a
a. Condyloid joint
b. Hinge joint
c. Saddle joint
d. Gliding joint
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Test Your Knowledge (p. 128)
3. A joint in which flat bone surfaces move side to side past each other is known as a
a. Condyloid joint
b. Hinge joint
c. Saddle joint
d. Gliding joint
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Test Your Knowledge (p. 128)
4. This lubricant helps to prevent wear in joints:
a. Pleural fluid
b. Synovial fluid
c. Mucus
d. Petroleum jelly
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Test Your Knowledge (p. 128)
4. This lubricant helps to prevent wear in joints:
a. Pleural fluid
b. Synovial fluid
c. Mucus
d. Petroleum jelly
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5. These structures attach bone to bone:
a. Ligaments
b. Tendons
c. Cords
d. Articulations
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5. These structures attach bone to bone:
a. Ligaments
b. Tendons
c. Cords
d. Articulations
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6. A young gymnast falls form the balance beam, rotating her knee. This is a problem because
a. The knee is a hinge joint and should not rotate
b. The knee should only rotate when standing
c. The knee joint is not a freely moving joint
d. There is no problem, knees are supposed to rotate
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Test Your Knowledge (p. 124)
6. A young gymnast falls form the balance beam, rotating her knee. This is a problem because
a. The knee is a hinge joint and should not rotate
b. The knee should only rotate when standing
c. The knee joint is not a freely moving joint
d. There is no problem, knees are supposed to rotate
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Test Your Knowledge (p. 138)
1. Which of the following bones is considered to be part of the axial skeleton?
a. Humerus
b. Patella
c. Femur
d. Sternum
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Test Your Knowledge (p. 138)
1. Which of the following bones is considered to be part of the axial skeleton?
a. Humerus
b. Patella
c. Femur
d. Sternum
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2. The number of vertebra in the thoracic region is
a. 5
b. 7
c. 12
d. 120
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2. The number of vertebra in the thoracic region is
a. 5
b. 7
c. 12
d. 120
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3. The posterior skull bone is the
a. Parietal
b. Cervical
c. Occipital
d. Zygomatic
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3. The posterior skull bone is the
a. Parietal
b. Cervical
c. Occipital
d. Zygomatic
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4. The last two pairs of ribs are
a. Vertebrosternal
b. Vertebrocostol
c. Vertebroclavical
d. None of the above
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4. The last two pairs of ribs are
a. Vertebrosternal
b. Vertebrocostol
c. Vertebroclavical
d. None of the above
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5. The shoulder blade is more technically known as the
a. Clavicle
b. Scapula
c. Sternum
d. Pelvis
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5. The shoulder blade is more technically known as the
a. Clavicle
b. Scapula
c. Sternum
d. Pelvis
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6. Beth has fractured her humerus. What is in a cast?
a. Her leg
b. Her arm
c. Her neck is in a brace
d. Her entire body
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6. Beth has fractured her humerus. What is in a cast?
a. Her leg
b. Her arm
c. Her neck is in a brace
d. Her entire body
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End of Chapter
Review Questions
1. Your elbow is an example of what type of joint?
a. Hinge joint
b. Ball-and-socket joint
c. Gliding joint
d. Fibrous joint
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1. Your elbow is an example of what type of joint?
a. Hinge joint
b. Ball-and-socket joint
c. Gliding joint
d. Fibrous joint
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Review Questions
2. The sternum is the correct medical term for which bone?
a. Shin bone
b. Breast bone
c. Shoulder blade
d. Collarbone
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Review Questions
2. The sternum is the correct medical term for which bone?
a. Shin bone
b. Breast bone
c. Shoulder blade
d. Collarbone
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Review Questions
3. The end of a long bone is the:
a. Diplodicus
b. Epiphysis
c. Condylcorn
d. Perla
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Review Questions
3. The end of a long bone is the:
a. Diplodicus
b. Epiphysis
c. Condylcorn
d. Perla
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Review Questions
4. The presence of a(n) ___________ in skeletal remains indicates the skeleton is a teenager or child.
a. Torquer center
b. Ossifier
c. Mantoux membrane
d. Epiphyseal plate
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Review Questions
4. The presence of a(n) ___________ in skeletal remains indicates the skeleton is a teenager or child.
a. Torquer center
b. Ossifier
c. Mantoux membrane
d. Epiphyseal plate
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Review Questions
5. The aging process, excessive caffeine, and cigarette smoking can each contribute to this bone disease:
a. Ligamental stenosis
b. Osteoporosis
c. Cartilentious dementia
d. Ossification
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Review Questions
5. The aging process, excessive caffeine, and cigarette smoking can each contribute to this bone disease:
a. Ligamental stenosis
b. Osteoporosis
c. Cartilentious dementia
d. Ossification
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Review Questions
6. Joe injured his elbow as a child and now, as an adult, his injured arm is much shorter than the other arm. Why?
a. Fractured bone is always shorter
b. His epiphyseal plate was damaged and the bone didn’t grow
c. He has arthritis in the joint, which decreases bone growth
d. He has a congenital problem that caused both the injury and the shorter bone
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Review Questions
6. Joe injured his elbow as a child and now, as an adult, his injured arm is much shorter than the other arm. Why?
a. Fractured bone is always shorter
b. His epiphyseal plate was damaged and the bone didn’t grow
c. He has arthritis in the joint, which decreases bone growth
d. He has a congenital problem that caused both the injury and the shorter bone
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Review Questions
1. Name three large appendicular bones femur, humerus & tibia.
2. List three places where cartilage is found in the body. nose, ears, & between ribs.
3. Synovial fluid is a liquid found in joints that keeps them lubricated.
4. The specialized cells that constantly rebuild bone are called osteoblasts.
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Review Questions
5. These specialized cells are needed to tear down bone: osteoclast.
6. Bone must be set to heal the fracture.
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Review Questions
1. Describe the difference between tendons and ligaments.
Tendons attach muscle to bone. Ligaments attach bone to bone.
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Classroom Response System
Page 103
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Which of the following is NOT a bone
shape classification?
a. Long
b. Flat
c. Irregular
d. Concave
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Which of the following is NOT a bone
shape classification?
a. Long
b. Flat
c. Irregular
d. Concave
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The tough, fibrous connective tissue
surrounding bone is:
a. Periosteum
b. Haversian
c. Osseus envelope
d. Pericardium
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The tough, fibrous connective tissue
surrounding bone is:
a. Periosteum
b. Haversian
c. Osseus envelope
d. Pericardium
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The end of a long bone is its:
a. Diaphysis
b. Epiphysis
c. Cleft
d. Terminal end
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The end of a long bone is its:
a. Diaphysis
b. Epiphysis
c. Cleft
d. Terminal end
Page 109
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Storage of yellow marrow occurs in the:
a. Epiphysis
b. Clavicle
c. Sternum
d. Medullary Cavity
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Storage of yellow marrow occurs in the:
a. Epiphysis
b. Clavicle
c. Sternum
d. Medullary Cavity
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Which of the following is true of spongy
bone?
a. It is cancellous
b. It is arranged in bars and plates called trabeculae
c. It makes bones lighter and creates space for red bone marrow
d. All of the above
Page 112
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Which of the following is true of spongy
bone?
a. It is cancellous
b. It is arranged in bars and plates called trabeculae
c. It makes bones lighter and creates space for red bone marrow
d. All of the above
Page 113
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Which of the following is true of red
blood cells and RBC production?
a. It is known as hemopoiesis
b. The cells last about 120 days
c. There are approximately 25 trillion
d. All of the above
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Which of the following is true of red
blood cells and RBC production?
a. It is known as hemopoiesis
b. The cells last about 120 days
c. There are approximately 25 trillion
d. All of the above
Page 115
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The following bone surface structure is a large
rounded knob, usually articulating with another
bone:
a. Condyle
b. Crest
c. Periostium
d. Foramen
Page 116
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The following bone surface structure is a large
rounded knob, usually articulating with another
bone:
a. Condyle
b. Crest
c. Periostium
d. Foramen
Page 117
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Mature bone cells are known as:
a. Osteoprogenitor cells
b. Osteoblasts
c. Osteoclasts
d. Osteocytes
Page 118
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Mature bone cells are known as:
a. Osteoprogenitor cells
b. Osteoblasts
c. Osteoclasts
d. Osteocytes
Page 119
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The cells that actually form bones are:
a. Haversian cells
b. Osteoblasts
c. Osteoclasts
d. Trabeculae
Page 120
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The cells that actually form bones are:
a. Haversian cells
b. Osteoblasts
c. Osteoclasts
d. Trabeculae
Page 121
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During endochondral ossification
a. A membrane turns to bone
b. Bone ends are brought into contact
c. Cartilage turns to bone
d. Bone is destroyed
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During endochondral ossification
a. A membrane turns to bone
b. Bone ends are brought into contact
c. Cartilage turns to bone
d. Bone is destroyed
Page 123
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A special dense form of connective tissue that often
provides shape and can withstand a fair amount of
flexing, tension, and pressure is:
a. Cartilage
b. Tendon
c. Ligaments
d. Muscle
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A special dense form of connective tissue that often
provides shape and can withstand a fair amount of
flexing, tension, and pressure is:
a. Cartilage
b. Tendon
c. Ligaments
d. Muscle
Page 125
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The fluid that lubricates joints is:
a. Synovial
b. Cerebrospinal
c. Lymphatic
d. All of the above
Page 126
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The fluid that lubricates joints is:
a. Synovial
b. Cerebrospinal
c. Lymphatic
d. All of the above
Page 127
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An example of a hinge joint is the:
a. Hip
b. Wrist
c. Elbow
d. Neck
Page 128
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An example of a hinge joint is the:
a. Hip
b. Wrist
c. Elbow
d. Neck
Page 129
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Movement that decreases the angle between
involved bones when bending a joint is:
a. Extension
b. Flexion
c. Protraction
d. Adduction
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Movement that decreases the angle between
involved bones when bending a joint is:
a. Extension
b. Flexion
c. Protraction
d. Adduction
Page 131
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The thorax, spinal column, hyoid, skull,
and middle ear bones are part of the:
a. Appendicular skeleton
b. Axial skeleton
c. Columnar skeleton
d. Cytoskeleton
Page 132
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The thorax, spinal column, hyoid, skull,
and middle ear bones are part of the:
a. Appendicular skeleton
b. Axial skeleton
c. Columnar skeleton
d. Cytoskeleton
Page 133
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The manubrium, body, and xiphoid are
parts of the:
a. Cell
b. Neuron
c. Clavicle
d. Sternum
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The manubrium, body, and xiphoid are
parts of the:
a. Cell
b. Neuron
c. Clavicle
d. Sternum
Page 135
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Hairline, simple, spiral, greenstick, and
comminuted are all:
a. Bone diseases
b. Types of cartilage
c. Types of fractures
d. Parts of the integument
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Hairline, simple, spiral, greenstick, and
comminuted are all:
a. Bone diseases
b. Types of cartilage
c. Types of fractures
d. Parts of the integument