Cardiac muscle cells differ from skeletal muscle cells in that cardiac muscle cells
A) possess narrower T tubules
B) are multinucleated, but their nuclei are not peripherally located
C) are the same length as the ventricles of the heart
D) require calcium in the extracellular compartment, or they cannot contract
E) can sustain contraction even during complete hypoxic conditions

Question

Quizplus · Accepted Answer

Cardiac muscle cells require extracellular calcium for contraction, in addition to the calcium released from the sarcoplasmic reticulum. This is different from skeletal muscle cells, which primarily rely on intracellular calcium release for contraction.

Cardiac Muscle Cells Differ from Skeletal Muscle Cells in That