Differentiate between striated unstriated and cardiac muscles on the basis of their structure and location in the body
Answers
these muscles are present in places of arms where these are controlled by wish.
unstriated-it is soft bands and uninucleated.
these muscles are present in places like small intestines that are not controlled by wish.
cardiac -it is sofe muscle and uninucleated.
these muscles make up heart.
Answer:
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: