Locomotion And Movement Question 2
Question: Which of the following statements 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 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
Answer: (3) B and C only
Explanation-
- 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.
BETA
