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.
A
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