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Which of the following statement 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 acting 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
Answers (1)
The correct answer is Option 2) B and C only.
Statement B is correct. The sarcoplasmic reticulum of muscle fibers is a specialized type of endoplasmic reticulum that stores and releases calcium ions (Ca2+) during muscle contraction.
Statement C is correct. The striated appearance of skeletal muscle fibers is due to the arrangement and distribution pattern of actin and myosin proteins, which form the contractile units called sarcomeres.
For incorrect options,
Statement A is incorrect. Muscle bundles in skeletal muscle are held together by a collagenous connective tissue layer called perimysium, not fascicle.
Statement D is incorrect. The M line is a structural component of the sarcomere, but the functional unit of contraction in skeletal muscle is the sarcomere itself, not specifically the M line.
Therefore, the correct answer is Option 2) B and C only.
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