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:
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.
Asked in: NEET 2023 (All India)