Calcium ions initiate sliding of filaments in skeletal muscles by
A) breaking the actin-myosin cross-bridges.
B) binding to the troponin complex, which then relocates tropomyosin.
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.

Question

Quizplus · Accepted Answer

Calcium ions bind to the troponin complex causing a conformational change that causes tropomyosin to move and expose the myosin-binding sites on actin, allowing the sliding of filaments to occur.

Calcium Ions Initiate Sliding of Filaments in Skeletal Muscles by