This is found in the heart. It consists of short,
branched cylindrical fibres joined end to end. The adherent ends of adjacent
fibres form dark intercalated discs. Each fibre contains a single central
nucleus and striated myofibrils resembling those of voluntary muscle. It is
supplied by the autonomic nervous
system, but heart muscle also has the properties
of spontaneous and rhythmic activity. The conducting system
of the heart is made up of modified cardiac muscle
cells.
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