Calcium Ions Initiate Sliding of Filaments in Skeletal Muscles by

question 61

Multiple Choice

Calcium ions initiate sliding of filaments in skeletal muscles by

• A)breaking the actin-myosin cross-bridges.
• B)binding to the troponin complex,which causes tropomyosin to move and thus expose myosin-binding sites.
• C)transmitting action potentials across the neuromuscular junction.
• D)spreading action potentials through the T tubules.
• E)reestablishing the resting membrane potential following an action potential.

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