Which structural feature of cardiac muscle cells enables action potentials to travel rapidly from cell to cell?
A) mitochondria
B) desmosomes
C) gap junctions
D) myofibrils
E) myoglobin

Question

Quizplus · Accepted Answer

Gap junctions are specialized regions of the cell membrane that allow direct, electrical communication between adjacent cells. In cardiac muscle, gap junctions are abundant and allow action potentials to rapidly travel from cell to cell, allowing for coordinated contraction of the entire heart.

Which Structural Feature of Cardiac Muscle Cells Enables Action Potentials