For relaxation to occur,
A) calcium leaves the sarcoplasmic reticulum, and troponin binds calcium and blocks the binding sites on actin.
B) calcium enters the myofibril, it detaches from myosin, and the binding sites on myosin become inactive.
C) sarcoplasm calcium levels fall, calcium is removed from troponin, and tropomyosin blocks binding sites on actin.
D) extracellular calcium levels fall, calcium is pumped into the myofibril, and tropomyosin slides away from actin.
Correct Answer:
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Q46: Phosphate transfer is used for
A) immediate ATP
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Q48: Acetylcholine is released from a neuron
A) by
Q49: The repolarization of the action potential involves
Q50: Acetylcholine exerts its effect by
A) stimulating the
Q52: When an impulse arrives at the knob
Q53: Which is the neurotransmitter that causes the
Q54: Myosin kinase catalyzes the transfer of Pi
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Q56: When a muscle relaxes,
A) crossbridges form and
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