Question

the intercalated discs seen in cardiac myocytes 1. have desmosomes which help to hold the muscle fibers together. 2. have gap junctions which allow action potentials to conduct from one muscle fiber to the next. 3. are the result of actin/myosin overlap. 1 only 2 only 3 only 1 and 2 are correct. 1, 2 and 3 are correct.

Explanation:

Intercalated discs in cardiac myocytes contain desmosomes that hold muscle fibers together and gap - junctions for action potential conduction. Actin/myosin overlap is related to sarcomere structure, not intercalated discs.

Answer:

1 and 2 are correct.