The segment of a myofibril that is called a sarcomere runs _________________________.
A. one A band to the next A band
B. between Actin and Myosin
C. from Z line to Z line
D. Between Actin filaments
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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.
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