Which of the following statements are correct regarding the skeletal muscle? A. Muscle bundles are held together by collagenous 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:

Question

Which of the following statements are correct regarding the skeletal muscle? A. Muscle bundles are held together by collagenous 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:, C and D only, A, B and C only, B and C only, A, C and D only

MARKS App · Accepted Answer

Muscle fascicles are held together by a common collagenous connective tissue layer called ligament. The sarcoplasmic reticulum in the muscle fibers resembles a network of smooth endoplasmic reticulums. This Sarcoplasmic reticulum functions as a storehouse of calcium iron. The striated appearance of the skeletal muscle fibre is a result of the distribution pattern of proteins myosin and actin. The sarcomere is responsible for the striated appearance of muscle. The actin is a thin filament and myosin is a thick filament. M line contains the protein called myomesin, and it marks the centre of the sarcomere. A sarcomere is the functional unit (contractile unit) of a muscle fiber. Hence, the most appropriate answer is option C, i.e., B and C only.

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