Why is calcium necessary for muscle contraction?
A) Calcium is needed to activate troponin so that tropomyosin can be moved to expose the myosin-binding sites on the actin filament.
B) Calcium is needed to allow the muscle fiber to become depolarized.
C) Calcium functions as a neurotransmitter and is released from the motor neuron.
D) Calcium is needed to cock the myosin head so that it can form a cross-bridge with actin.
E) Calcium is needed to detach the myosin from the actin.
Correct Answer:
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