First 125 words of the document:
Cardiac muscles are the muscles of the heart. They are selfcontracting, and must
continue to contract in rhythmic fashion for the whole life of the organism. Hence they
have special features:
The cells are Y shaped and are shorter and wider than skeletal muscle cells.
The arrangement of actin and myosin is similar to skeletal striated muscle.
Some of the cardiac muscle cells are autorhythmic, i.e they contract even in the
absence of neuronal innervation
Intercalated disks are located between cardiac muscles cells. These contain gap
junctions which provide communicating channels between cells.
The intercalated disks allow waves of depolarisations to sweep across the cells
thus synchronising muscle contraction.