Calcium Ions Initiate Sliding of Filaments in Skeletal Muscles by

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.