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Points which are correct with respect to...

Points which are correct with respect to cardiac muscle ?
(i) Have dark and light bands
(ii) Involuntory in nature
(iii) Similar to smooth muscle in structure
(iv) Muscle fibres are branched, cylindrical
(v) get fatigued after a long period.

A

(i), (ii), (iii)

B

(i), (ii), (iv)

C

(iii), (iv), (v)

D

(i), (iii), (v)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which points are correct with respect to cardiac muscle, let's analyze each statement one by one: 1. **Have dark and light bands**: - Cardiac muscle fibers are striated, similar to skeletal muscle, due to the regular arrangement of myofibrils into sarcomeres. This organization gives cardiac muscle its striped appearance, characterized by alternating dark (A bands) and light (I bands) bands. - **Conclusion**: This statement is correct. 2. **Involuntary in nature**: - Cardiac muscle is indeed involuntary, meaning it operates without conscious control. It is responsible for pumping blood throughout the body and functions automatically. - **Conclusion**: This statement is correct. 3. **Similar to smooth muscle in structure**: - This statement is incorrect. While cardiac muscle shares some functional characteristics with smooth muscle (both are involuntary), structurally, cardiac muscle is more similar to skeletal muscle due to its striations and branched fibers. Smooth muscle lacks striations and has a different structure. - **Conclusion**: This statement is incorrect. 4. **Muscle fibers are branched, cylindrical**: - Cardiac muscle fibers are indeed branched and cylindrical in shape. They are also typically uni-nucleate, meaning each fiber has one nucleus. - **Conclusion**: This statement is correct. 5. **Get fatigued after a long period**: - Cardiac muscle is designed to be highly resistant to fatigue. It continuously contracts throughout a person's life without tiring, which is essential for its role in maintaining blood circulation. - **Conclusion**: This statement is incorrect. ### Summary of Correct Statements: - (i) Have dark and light bands: **Correct** - (ii) Involuntary in nature: **Correct** - (iii) Similar to smooth muscle in structure: **Incorrect** - (iv) Muscle fibers are branched, cylindrical: **Correct** - (v) Get fatigued after a long period: **Incorrect** ### Final Answer: The correct points with respect to cardiac muscle are (i), (ii), and (iv).
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