★ Muscle Anatomy Quiz
Why are calcium ions necessary for skeletal muscle contraction?
A. Calcium ions cause ATP binding to actin.
B. Calcium ions release the inhibition on Z discs.
C. Calcium ions trigger the binding of myosin heads to actin filaments.
D. Calcium ions increase the speed of the action potential transmitted along the sarcolemma.
Preview next quiz:
The muscle fiber (cell) is indicated by ________.
A. Label C
B. Label B
C. Label A
D. Label D
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