SATHEE: Locomotion And Movement Question 2

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:

(1) C and D only

(2) A, B and C only

(3) B and C only

(4) A, C and D only

Show Answer

Statement A is incorrect because muscle bundles are held together by a collagenous connective tissue layer called the epimysium, not fascicle. A fascicle is a bundle of muscle fibers.
Statement B is correct because the sarcoplasmic reticulum in muscle fibers stores calcium ions, which are essential for muscle contraction.
Statement C is correct because the striated appearance of skeletal muscle fibers is due to the distribution pattern of actin and myosin proteins.
Statement D is incorrect because the M line is not the functional unit of contraction. The functional unit of contraction is called the sarcomere, which is the segment between two Z lines.