Q. The muscle band that remains unchanged during contraction and relaxation of the skeletal muscle is
A) I
B) H
C) A
D) A-line
Explanation
During contraction and relaxation of muscles, both I-band and H-zone progressively shorten and disappears. Dark A-band (anisotropic) undergo no change during contraction and relaxation of muscle fibres.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.