NEET 2023 Phase 1 · BiologyPrevious Year Question
Which of the following statements are correct regarding skeletal muscle? A. Muscle bundles are held together by collagenous connective tissue layer called fascicle. B. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions. C. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins. D. M line is considered as functional unit of contraction called sarcomere. Choose the most appropriate answer from the options given below:
Answer: (A) A, B and C only. Answer: A.
- A.A, B and C only✓
- B.B and C only
- C.A, C and D only
- D.C and D only
Correct Answer
(A) A, B and C only
Solution & Explanation
Answer: A. Statement A is correct: muscle bundles (fascicles) are held together by a common collagenous connective tissue layer (NCERT terms this layer fascia; the bundle itself is the fascicle). Statement B is correct: the sarcoplasmic reticulum is the store house of calcium ions. Statement C is correct: the striated appearance is due to the distribution pattern of actin and myosin. Statement D is WRONG: it is the portion between two successive 'Z' lines (not the 'M' line) that is the functional unit of contraction called the sarcomere. Hence A, B and C only. NCERT Ch 17, p.220, line 11: "between two successive ‘Z’ lines is considered as the functional unit of"
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