Question

Mention three features of cardiac muscles

Answer 1

Cardiac muscles:

1. Cardiac muscles are involuntary muscle groups. They are constantly contracting and relaxing in a cyclic pattern.
2. Cardiac muscles are made up of specialised cells called cardiomyocytes, or contractile myofibrils because they are long and cylindrical (shaped like a fibril) and they contract at a regular rate to keep blood flowing through the heart.
3. Cardiomyocytes are uninucleated, cylindrical, and elongated cells that make up the heart.
4. Cardiac muscles have faint cross-striations that do not become exhausted under normal conditions.
5. In vertebrates, cardiac muscle, commonly known as myocardium, is one of three primary muscle groups found solely in the heart.