Skeletal Muscle Contraction Begins When Calcium Ions Bind To

Question

Skeletal muscle contraction begins when calcium ions bind to
A) energized cross- bridges.
B) actin.
C) myosin.
D) troponin.
E) acetylcholine receptors.

Accepted Answer

Calcium ions bind to troponin, causing a conformational change that moves tropomyosin out of the way of the actin-myosin binding site, allowing for cross-bridge formation and muscle contraction to occur.