Electrical impulses are conducted between heart muscle cells by
A) intercalated discs.
B) intermediate junctions.
C) minute synapses of the sympathetic nervous system.
D) Purkinje fibers.

Question

Quizplus · Accepted Answer

Intercalated discs contain gap junctions that allow for electrical impulses to pass between cardiac muscle cells, enabling coordinated contraction of the heart. Intermediate junctions are not involved in electrical conduction in the heart. Synapses of the sympathetic nervous system are involved in regulating heart rate and contractility but do not directly conduct electrical impulses between heart muscle cells. Purkinje fibers are involved in conducting electrical impulses through the ventricles of the heart but are not involved in conduction between individual cardiac muscle cells.

Electrical Impulses Are Conducted Between Heart Muscle Cells by