1 Skeletal Muscles Myology My = muscle ology = study of Muscles 650 Males : 42% of body is muscle weight Females : 35% muscle weight in the body Voluntary - skeletal Involuntary – cardiac & smooth Cardiac muscle Heart Involuntary 1-2 nuclei Basket weave Striated Not regenerated Smooth muscles Involuntary Visceral 1 nuclei Spindle shaped Not striated Nerves – needed or not? regenerated Skeletal muscles Striated Needs a lot of ATP Moves skeleton Attached to bone Some regeneration occurs
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Muscles Cardiac muscle - Parkway Schools ppt.pdf · Involuntary Visceral 1 nuclei Spindle shaped ... Striated muscle ... muscle’s connection to the non-moveable bone
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Skeletal Muscles MyologyMy = muscle
ology = study of
Muscles 650
Males : 42% of body is muscle weight
Females : 35% muscle weight in the body
Voluntary - skeletal
Involuntary – cardiac & smooth
Cardiac muscleHeart
Involuntary
1-2 nuclei
Basket weave
Striated
Not regenerated
Smooth musclesInvoluntary
Visceral
1 nuclei
Spindle shaped
Not striated
Nerves – needed or not?
regenerated
Skeletal musclesStriated
Needs a lot of ATP
Moves skeleton
Attached to bone
Some regeneration occurs
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Muscle slidesUse the slides to view these –discuss with your partner the differences
Print out & label a picture of skeletal, cardiac and smooth muscle
Cardiac Muscle
Figure 7-10(a)
Figure 7-10(b)
Smooth Muscle TissueStriated muscle
Functions of skeletal musclesMovement
Posture / body position
Support of soft tissues
Protection
Homeostasis - temperature
Characteristics of muscles
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Tissue typesConnective
Epithelial
Muscle
Neural
Muscle connectionsOrigin – muscle’s connection to the non-moveable bone
Insertion – muscle’s connection to the moveable bone
Action - joint movement
Muscles work in pairsFlexor – contracted muscle (agonist)
Extensor – relaxed muscle (antagonist)
Ex. Biceps & triceps
What would happen if muscles worked alone?
Helper muscles = synergist
ex: brachioradialis- helps to flex
the elbow
Anatomy of Skeletal MusclesThe Organization of a Skeletal Muscle
Figure 7-1
Neuromuscular Junction page 191
Figure 7-4(a)
Essentials of Anatomy & Physiology, 4th EditionMartini /Bartholomew
PowerPoint® Lecture Outlines prepared by Alan Magid, Duke University
The MuscularSystemThe MuscularSystem77
Figure 7.2a
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Microanatomy page 188
–SarcolemmaMuscle cell membrane
–SarcoplasmMuscle cell cytoplasm
–Sarcoplasmic reticulum (SR)Like smooth ER
–Transverse tubules (T tubules)
–Myofibrils (contraction organelle)
–Sarcomeres
Movement due to Filaments:
Actin
Myosin
Energy – will need ATP
Sarcomere- smallest part of a muscle that contracts
2. Action potential travels through the cell via the T-TUBULES
3. Ca ions released from the cisternae
and bind to troponin
troponin change shape (twist) to expose the active site on the actin
4. Crossbridge forms as actin and myosin bind together using ATP
As actin slides toward center of each sarcomere – CONTRACTION occurs
5. Acetylcholinesterase (AChase)is released - ACh is broken down, Ca crossbridges break, Ca goes back to the cisternae, actin returns to resting position
Delivers oxygen and nutrients; removes carbon dioxide, lactic acid, and heatSkeletal muscle contractions assist in moving blood through veins; protects deep blood vessels