Statement I : Cardiac muscle of the heart is striated and has intercalated discs between its fibres

Question

Statement I : Cardiac muscle of the heart is striated and has intercalated discs between its fibres (cells).\ Statement II: Intercalated discs provide quick, powerful and rhythmic contractions to the heart.\

Professor PC Thomas Classes · Answer

(a) : Cardiac muscles are present in heart. Cardiac muscle tissue fibres show the characters of both striated and unstriated muscle fibres. The myofibrils have dark and light bands, thus they are striated but they are not under the control of the will of the animal, thus they are involuntary. They have intercalated discs at intervals. These discs permit the wave of muscle contraction to be transmitted from one cardiac fibre to another. This provides quick, powerful and rhythmic contractions to the heart.