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:
A, B and C only
B and C only
A, C and D only
C and D only
Statement A is incorrect because the connective tissue layer holding muscle bundles together is called fascia, not fascicle. Statement B is correct as the sarcoplasmic reticulum stores calcium ions. Statement C is correct because the striations are due to the arrangement of actin and myosin. Statement D is incorrect because the functional unit of contraction is the sarcomere, which is the segment between two Z-lines, not the M-line.
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