MICROANATOMY

Detailed explanation-1: -The individual cardiac muscle cell (cardiomyocyte) is a tubular structure composed of chains of myofibrils, which are rod-like units within the cell. The myofibrils consist of repeating sections of sarcomeres, which are the fundamental contractile units of the muscle cells.

Detailed explanation-2: -Cardiac muscle cells (cardiomyocytes) are striated, branched, contain many mitochondria, and are under involuntary control.

Detailed explanation-3: -Only cardiac muscle tissue, comprising cells called myocytes, is present in the heart.

Detailed explanation-4: -While cardiomyocytes are muscle cells, they are different from other muscle cells in a number of ways. Unlike other muscle cells in the body, cardiomyocytes are highly resistant to fatigue and therefore always contracting and relaxing to ensure proper circulation of blood around the body.

Detailed explanation-5: -Answer and Explanation: Cardiac muscle cells are also known as cardiac myocytes. Adjacent cells are joined together by intercalated discs, which allow the heart to contract as a unit.