Question

define the structure of cardiac muscle​

Answer 1

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♀️They are involuntary muscles and are found only in the Wall of heart or myocardium.

♀️An individual fibre is intermediate between striated and unstriated muscle fibres.

♀️These are short, branched fibres with ill-defined sarcolemma.

♀️Basically the fibres are uninucleated but as they are joined together by neighbouring cardiac muscle fibres it appears to be multinucleated.

♀️The branches of different fibres join together to form a network.

♀️The place where the fibres unite is marked by presence of special zigzag junctions call intercalated discs.

♀️Intercalated discs are unique features of cardiac muscles and are formed by transverse thickenings of sarcolemma.

♀️They show presence of alternate light and dark bands.

♀️The contraction of cardiac muscle is initiated from a particular joint in heart which is known as pacemaker.

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THÅÑKẞ....!!

Answer 2

They are long,cylindrical branched with faint striations and involuntary in nature