In which of the following combinations, both components have non-striated muscle fibers?
Correct answer: B. Intestine & blood vessels
- A. Intestine & biceps
- B. Intestine & blood vessels
- C. Heart & lungs
- D. Stomach & heart
Explanation
The walls of the intestine and of blood vessels both contain smooth muscle, which has no striations and works involuntarily. The biceps is skeletal muscle and the heart is cardiac, and both of those are striated, so any pairing including them fails. Recognising which organ contains which muscle type is the whole of this question.
This question appeared on the UHS MDCAT 2025 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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