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Sustained Contractions
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Gravity
Muscles, Anatomy, Physiology
Terms in this set (9)
Sustained Contraction
Commonly involve tectanic contractions that are smooth because the spinal chord nerves coordinate contractions.
Muscle tone (tonus)
results from a continuous state of partial contraction; important in maintaining your posture
Concentric Contractions
contract with a force greater than the resistance. example is picking up a book
Eccentric Contractions
contract with a force less than the resistance; example is walking down stairs
Isometric Contractions
Contract with no movement; example is pushing against something
Muscle Fiber Contractions
vary in speed and in the way they produce ATP; glycolytcally and oxidatively
Slow twitch (red fibers)
always oxidative and are fatigue resistant. Contain lots of myoglobin and make up the long muscles of the back and the superficial abdominal cavity
Fast Twitch (white fibers)
Glyclolytic and contract rapidly and fatigue rapidly; found in hands and eyes
Fast twitch fatigue resistance
intermediate fibers; they have the speed of a fast twitch white fibers but the fatigue resistance of the slow twitch red fibers.
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