Which of the following are present in the internal organs, like the stomach, intestine, etc.?
Correct answer: A. Option A
- A. Option A
- B. Option B
- C. Option C
- D. Both A and B
- E. Both A and C
Explanation
Smooth muscles are present in the walls of internal organs such as the stomach, intestine, bladder, etc. They are non-striated muscles that are not under voluntary control. Cardiac muscle, represented by option B, is found only in the heart and is also striated like skeletal muscle. Skeletal muscles, represented by option C, are attached to the bones and are under voluntary control. Therefore, the correct answer is option A.
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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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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