The following associations are correct ;
a) intercalated disc : located at the ends of cardiac muscle cells
c) cardiac endomysium : attaches to integrins near the z-line
Intercalated discs are sophisticated structures that connect neighboring cardiac muscle cells. Desmosomes, fascia adherens junctions, and gap junctions are the three types of cell junctions recognized as constituting an intercalated disc. Fascia adherens serve as actin anchoring sites and connect to the nearest sarcomere.
Cardiac muscle cells, like skeletal muscle cells, are surrounded and separated by a connective tissue layer called endomysium.
The endomysium, which literally means "within the muscle," is a wispy layer of areolar connective tissue that encases each individual muscle fiber or muscle cell. Capillaries and nerves are also present. The sarcolemma is the membrane that covers the cell membrane of the muscle fiber.
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