Diaphragm is a sheet of:
Correct answer: C. Skeletal muscles
- A. Smooth muscles
- B. Cardiac muscles
- C. Skeletal muscles
- D. All of these
Explanation
The floor of the chest is called diaphragm which is a sheet of skeletal muscles. Diaphragm contracts during inhalation and expands during exhalation.
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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About Muscles
Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
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