Skeletal and Muscular Systems • Myth No. 1: A fracture is a milder form of bone injury than a broken bone. • Myth No. 2: Once bones are fully developed, they stop changing. • Myth No. 3: Osteoporosis is a painful bone condition. • Myth No. 4: Vitamin D deficiency causes rickets, a disease of malnourished children. • Myth No. 5: If you have broken a bone, you'll know it right away. • Myth No. 6: A broken bone heals stronger than it was before the break. 2 Bone myths
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Skeletal and Muscular Systems
• Myth No. 1: A fracture is a milder form of bone injury than a broken bone.
• Myth No. 2: Once bones are fully developed, they stop changing.
• Myth No. 3: Osteoporosis is a painful bone condition.
• Myth No. 4: Vitamin D deficiency causes rickets, a disease of malnourished children.
• Myth No. 5: If you have broken a bone, you'll know it right away.
• Myth No. 6: A broken bone heals stronger than it was before the break.
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Bone myths
Skeletal System
• The framework for your body • 206 bones • “Os-” bone; • “Osteo-” bone • Two divisions
–Axial: Skull, vertebrae, ribs, sternum –Appendicular; arms and legs.
• Contains both bone tissue and cartilage
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Osteocytes are bone cells
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Bone contains:• Minerals – especially calcium which
provides for the hardness of bone • Collagen fibers which provides
strength of bone • If one or the other is missing bones
will be soft or brittle
Bone has an excellent blood supply
Joint• “art-” and “arthr-” mean joint • Ligaments stabilize joints • Cartilage caps the bones at the joint
for a smooth surface
Cartilage
• “chondr-” means cartilage • Healing capability is poorer than
bone • Mostly due to decreased blood
supply.
Skeleton Function
• Framework; muscles attach • Support; allows upright posture • Movement; muscle leverage • Protection; Brain, lungs, heart, etc. • Blood cell production from bone
marrow; red and white blood cells • Storage of minerals & fat; calcium,
phosphate. • Fat in yellow marrow.
Disorders of Skeleton-Osteoporosis
Incidence• Common in the U.S. • Responsible for many