Electrical impulses are conducted between heart muscle cells by
A)intercalated discs.
B)intermediate junctions.
C)active transport of sodium between cells.
D)Purkinje fibers.

Question

Quizplus · Accepted Answer

Intercalated discs are specialized junctions between cardiac muscle cells that allow for the rapid conduction of electrical impulses between cells. They contain gap junctions, which are channels that allow for the movement of ions between cells, allowing depolarization to rapidly spread throughout the heart muscle. Intermediate junctions and active transport of sodium between cells are not involved in the conduction of electrical impulses in the heart. Purkinje fibers are specialized cardiac muscle cells that are involved in transmitting electrical impulses to the ventricles of the heart, but they are not directly involved in the conduction of impulses between individual heart muscle cells.

Electrical Impulses Are Conducted Between Heart Muscle Cells by