A cardiac muscle cell is: Question 31 options: a voluntary muscle just like skeletal muscle. contracts spontaneously. is joined to other cardiac muscle cells by structures called intercalated discs. has numerous nuclei. Two of the statements above are correct.

The correct answer is: Two of the statements above are correct.

A cardiac muscle cell contracts spontaneously and is joined to other cardiac muscle cells by structures called intercalated discs.

Explanation:

Cardiomyocytes, the only ones responsible for the contractile function of the myocardium, are terminally differentiated cells that cease to proliferate almost immediately after birth. Cardiomyocytes are mononucleated cells, with the nucleus in a central position. These are linked together by the so-called intercalary discs, which appear as dark bands in histological preparations, and which are a set of junction complexes where desmosomes and adherent junctions can be found (here called fascia adherens). The intercalary discs are therefore the boundaries between cells.