Cardiac muscles are found in the heart which is self-stimulating, has an intermediate speed of contraction and energy requirement, and is responsible for performing muscular involuntary movements.
Features of cardiac muscles
Listed below are three features of cardiac muscles:
- Cardiac muscles are involuntary muscles. They are involved in continuous rhythmic contraction and relaxation.
- Cardiomyocytes or the cardiac cells are uninucleate, cylindrical, and elongated
- Cardiac muscles display faint cross-striations which do not get fatigued under normal circumstances.
Cardiomyocytes(cardiac cells) have the potential to carry out the contractile function of the heart thus enabling the pumping of blood throughout the body. They consist of branched fibres and possess intercalated discs between the muscle fibres. The discs stain darkly and are arranged right angles to the muscle fibres. They exhibit zigzag bands cutting across the muscle fibres.