Skeletal Muscle Contraction Begins When Calcium Ions Bind To

Question

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

Accepted Answer

Calcium ions bind to troponin on the actin filament, causing a conformational change that allows the myosin cross-bridge to bind to actin and initiate muscle contraction.