During a cross-bridge cycle in skeletal muscle,
A) the cross bridge is energized when it splits ATP into ADP and P
B) the cross bridge must bind with ATPase before a power stroke will occur
C) Ca₂₊ causes tropomyosin to move off of the myosin's actin-binding sites
D) ADP binds to the cross bridge at the end of the power stroke
E) both a and b occur
Correct Answer:
Verified
Q17: Muscle fibers develop tension by
A)contraction of sarcomeres
B)shortening
C)the
Q18: Actin
A)does not perform a power stroke during
Q19: Cross bridges
A)bind to actin during muscle contraction
B)are
Q20: During contraction of a sarcomere,
A)the Z discs
Q21: During contraction of skeletal muscle fibers, the
A)contractile
Q23: Binding of _ to myosin permits the
Q24: During contraction, asynchronous cycling of cross bridges
A)prevents
Q25: Which statement is not true about cross
Q26: An action potential rapidly spreads to the
Q27: The T tubules
A)store Ca₂₊
B)provide a means of
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