Which of the following options CORRECTLY describes the features of muscles found in the walls of stomach and intestine of humans?
Correct answer: B. Unstriped and spindle shaped with one nucleus per cell
- A. Irregularly striped and spindle shaped with one nucleus per cell
- B. Unstriped and spindle shaped with one nucleus per cell
- C. Unstriped, branched and voluntary in action
- D. Striped, cylindrical and voluntary in action
Explanation
The correct answer is Option B: 'Unstriped and spindle shaped with one nucleus per cell.' This describes the smooth muscle tissue that is found in the walls of the stomach and intestine. These muscles are non-striated (unstriped), have a single central nucleus, and are spindle-shaped, allowing them to function involuntarily to aid in digestion. Option A is incorrect because it mentions 'irregularly striped,' which does not describe smooth muscles. Option C is incorrect because it describes characteristics that do not match smooth muscle, including being voluntary. Option D is incorrect because it describes skeletal muscles, which are not present in the walls of the digestive organs.
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