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
A, B and C only
- B
B and C only
- C
A, C and D only
- D
C and D only
Sarcoplasmic reticulum stores Ca released during excitation (B correct). The striations arise from the orderly arrangement of actin (thin) and myosin (thick) filaments (C correct). Muscle bundles are wrapped in fascia — "fascicle" itself refers to the bundle, not the wrapping layer (A wrong). The sarcomere is the region between two successive Z-lines, not bounded by M-lines (D wrong).
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