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

Question

Quizplus · Accepted Answer

Calcium ions enter cardiac muscle cells through slow ion channels, which is crucial for the contraction process. This influx of calcium triggers further release of calcium from the sarcoplasmic reticulum, facilitating muscle contraction.

In Cardiac Muscle