Which of the following statements are correct | vedclass

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(C) Statement $A$ is incorrect because muscle bundles are held together by a collagenous connective tissue layer called fascia,not fascicle. The bundl

Vedclass · Accepted Answer

$B$ and $C$ only

Vedclass · Answer

(C) Statement $A$ is incorrect because muscle bundles are held together by a collagenous connective tissue layer called fascia,not fascicle. The bundles themselves are called fascicles.Statement $B$ is correct because the sarcoplasmic reticulum of muscle fibres is indeed a storehouse of calcium ions,which are essential for muscle contraction.Statement $C$ is correct because the striated appearance of skeletal muscle fibres is due to the regular distribution pattern of actin and myosin proteins.Statement $D$ is incorrect because the portion of the myofibril between two successive $Z$-lines is considered the functional unit of contraction,called a sarcomere,not the $M$-line.Therefore,only statements $B$ and $C$ are correct.

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