2013 NEET Locomotion and MovementStructure of muscle Medium Question 41 of 65 in Locomotion and Movement

The H-zone in the skeletal muscle fibre is due to:

A extension of myosin filaments in the central portion of the A-band
B the absence of myofibrils in the central portion of A-band
C the central gap between myosin filaments in the A-band
D the central gap between actin filaments extending through myosin filaments in the A-band

The answer is D.

Solution

In the resting state the thin actin filaments from both sides do not meet at the centre of the A-band. This central part, with only thick filaments, is the H-zone.

Concept H-zone

Locomotion and Movement in past papers

65 questions from this chapter have appeared across 25 exam years.