NEET Previous Year Question
The H-zone in the skeletal muscles fibre is due to
Topic: NEET PYQ
Answer: C. Full step-by-step solution below.
- AThe absence of myofibrils in the central portion of A-band.
- BThe central gap between myosin filaments in the A-band.
- CThe central gap between actin filaments extending through myosin filaments in the A-band.
- DExtension of myosin filaments in the central portion of the A-band.
Correct answer: C
Solution
(c) (a) Incorrect → Myofibrils are present throughout the muscle fiber.(b) Incorrect → There is no central gap between myosin filaments.
(c) Correct → The H-zone is the central region of the A-band where only myosin filaments are present because actin filaments do not extend into this region.
(d) Incorrect → The H-zone is not formed due to extension of myosin filaments.
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