Question

9) Differentiate between striated, unstriated and cardiac muscles on the basis of
their structure and site/location in the body.
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Answer 1

Explanation:

Striated muscle

They are cylindrical in shape and multi nucleate.

They are present in body parts such as hands and legs.

Unstriated muscle

They spindle shaped and uninucleate.

They are present in the wall of food canal, stomach, mouth, iris etc.

Cardiac muscles

They are cylindrical branched and uninucleate

They are present in the heart.

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Answer 2

Answer:

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Difference between Striated Muscle Fibres , Smooth Muscle Fibres and cardiac Muscle Fibres :  

♣ STRAITED MUSCLE FIBRES :  

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◆ They are long cyclindrical cells.

◆ The fibres have blunt ends.

◆ They possess striations or alternate light and dark bands.

◆ Intercalated discs and cross connections are absent.

◆ The muscle fibre is multinucleate . nuclei are oval in outline . They occur peripherally below the sarcolemna.

◆ They occur in bundles.

◆ Straited muscle fibres occur in limbs, hands, feet , body wall, tounge , pharynx and upper part of oesophagus.

◆ They are voluntary .

◆ They are able to perform fast and powerful contractions.

◆ They soon get fatigued.

♣ SMOOTH MUSCLE FIBRES :  

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◆The fibres are elongated and spindle shaped.

◆The fibres have pointed ends.

◆ Striations or light and dark bands are absent.

◆ Intercalated discs and cross- connections are absent.

◆ Smooth Muscle Fibres is uninucleate . nucleus is centrally placed , oval or elongated.

◆ They generally form sheets.

◆ The fibres occur in dermis, urinogenitical tracts, digestive tract , lungs, Iris, blood vessels, etc.

◆ They are involuntary.

◆ They perform slow but prolonged contractions.

◆ Fatigue is rare.

♣ CARDIAC MUSCLE FIBRES :  

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◆ The cells are small and cyclindrical.

◆ The fibres have broad ends. Striations are present but they are fainter than those of Straited muscle fibres.

◆ Intercalated discs and cross- connections are present.

◆ The cells are uninucleate . nucleus in oval- rounded . It is centrally placed.

◆ They form a network.

◆ The muscle fibres occur only in the wall of heart.

◆ They are involuntary.

◆ cardiac Muscle fibres performs powerful and rhythmic contractions.

◆ They seldom get fatigued.

Explanation: