In cardiac muscle,calcium ions
A)are not released from the sarcoplasmic reticulum.
B)do not bind to troponin molecules.
C)play no role in the process of contraction.
D)enter the cell through slow voltage gated ion channels.
E)play an important role in repolarizing the membrane after the depolarization phase.

Question

Quizplus · Accepted Answer

Calcium ions enter cardiac muscle cells through slow voltage-gated ion channels during the plateau phase of the action potential, which is crucial for the prolonged contraction characteristic of cardiac muscle.

In Cardiac Muscle,calcium Ions