Which structures join adjacent cardiac muscle cells end-to-end in the ventricles
A)intercalated discs
B)sarcomeres
C)Purkinje fibres
D)sinoatrial nodes

Question

Quizplus · Accepted Answer

Intercalated discs join adjacent cardiac muscle cells end-to-end in the ventricles. They contain gap junctions which allow electrical impulses to pass from cell to cell, coordinating the contraction of the ventricles. Sarcomeres are the basic units of muscle contraction, but they do not directly join adjacent cardiac muscle cells. Purkinje fibers and sinoatrial nodes are involved in the electrical conduction system of the heart, but they do not join adjacent cardiac muscle cells end-to-end in the ventricles.

Which Structures Join Adjacent Cardiac Muscle Cells End-To-End in the Ventricles