differentiate between striated,unstriated and cardiac muscles on the basis of their structure and location in the body
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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.
♣ STRAITED MUSCLE FIBRES :
----------------------------------------------
→ 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 :
----------------------------------------------
→ 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 :
---------------------------------------------
→ 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.
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