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BIO101: CH9

QuestionAnswer
ATP Main energy source for skeletal muscle fiber contraction
Creatine Phosphate Secondary energy source for skeletal muscle fiber contraction
Isotonic contraction Muscle contracts and changes length; means "equal force"
Concentric contraction Shortening contraction; occurs when lifting an object
Eccentric contraction Lengthening contraction; occurs when force is not sufficient to lift an object or resistance
Isometric contraction Muscle contracts but does not change length; means "equal length"; tension develops but attached parts do not move
Isometric contraction example Yoga
Slow-twitch fibers (Type I) Always oxidative; red fibers
Fast-twitch fatigue-resistant fibers (Type IIa) White fibers
Fast-twitch glycolytic fibers (Type IIb) Use anaerobic respiration (glycolysis); white fibers with less myoglobin; susceptible to fatigue
Visceral smooth muscle Found in the walls of most hollow organs; most common type of smooth muscle
Smooth muscle neurotransmitters Acetylcholine (ACh) and norepinephrine (NE)
Cardiac muscle Located only in the heart; striated muscle cells; fibers joined by intercalated discs
Agonist Muscle that causes an action
Prime mover Agonist primarily responsible for a movement
Synergists Muscles that assist the agonist or prime mover
Antagonist Muscle whose contraction causes movement in the opposite direction of the prime mover
Created by: jullian18
 

 



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