If All of the Ca²⁺ Within a Muscle Fiber Was

Multiple Choice

If all of the Ca²⁺ within a muscle fiber was removed, which of the following could still occur?

A) The heads of the myosin myofilaments would bind to G-actin to form cross-bridges.
B) An action potential that was produced at the neuromuscular junction would be propagated along the sarcolemma.
C) The troponin molecules bound to G actin molecules would be released, causing tropomyosin to move.
D) The heads of the myosin molecules would return to their resting position, and the recovery stroke would occur.