Which of the following statements are correct regarding skeletal muscle? Choose the most appropriate answer from the options given below:
- B and C only
- A, C and D only
- C and D only
- A, B and C only
Answer
(1) B and C only
Solution
A: Muscle bundles (fascicles) are held together by a collagenous connective tissue layer called fascia, not 'fascicle' — so statement A is incorrect.
B: The sarcoplasmic reticulum of a muscle fibre is the store house of calcium ions — correct.
C: The striated appearance is due to the distribution pattern of actin and myosin proteins — correct.
D: The sarcomere (functional unit of contraction) is the portion of the myofibril between two successive Z lines, not the M line — so statement D is incorrect.
So only B and C are correct.
Answer: (1)