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20 Cards in this Set
- Front
- Back
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Skeletal |
Attach to and cover bone surfaces Striated, voluntary Overall body mobility Have muscle fibers |
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Cardiac |
Only in heart, straited, involuntary Contract steadily |
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Smooth |
In walls of hollow visceral organs Nonstriated, involuntary Force fluids through internal body channels Have muscle fibers |
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Produce movement (function) |
All locomotion and manipulation, responsiveness Cardiac: pumps blood Smooth: digestive tract |
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Main posture and body position (function) |
Small adjustments to counteract gravity |
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Stabilize joints (function) |
Strengthen and stabilize joints |
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Generate heat (function) |
Contractions, maintain body temp |
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A bands (striation) |
Lighter regions in midsection called H-Zone, has dark line called M-line |
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I band (striations) |
Midline interruption, dark area called Z disc |
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Sliding filament model of contraction |
During contraction, thin filaments slide past the thick ones so that actin and myosin filaments overlap to greater degree |
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Muscle shortening |
I band shortens Distance between successive z discs shortens H zones disappear Contiguous A bands move closer together, length does not change |
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Aerobic exercise |
Number of capillaries surrounding muscle fibers increase Number of mitochondria within muscle fibers increase Fibers synthesize more myogoblin |
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Muscle contraction |
During contraction, globular heads link thin and thick filaments together building cross bridges Swivel around their point of attachment acting as motors to generate force |
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Excitability/Responsiveness |
Ability of a cell to receive and respond to a stimulus by changing its membrane potential |
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Contractility |
Ability to shorten forcibly when adequately stimulated |
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Extensibility |
Ability to extend or stretch |
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Elasticity |
Ability of a muscle cell to recoil and resume its resting length after stretching |
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Epimysium |
An overcoat of dense irregular connective tissue that surrounds the whole muscle |
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Perimysium |
Layer of dense irregular connective tissue that surrounds each fascicle |
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Endomysium |
A wispy sheath of connective tissue that surrounds each individual muscle fiber |
