Physiology & Biochemistry · single question
Which fibers mediate contraction (vasoconstriction) of blood vessels?
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Correct answer: C. C fibers
Postganglionic sympathetic vasoconstrictor fibers are type C (unmyelinated).
- A. A-gamma fibers innervate intrafusal muscle spindle fibers, not vessels.
- B. A-beta carry touch/pressure sensation, not autonomic vasomotor signals.
- C. Correct. Postganglionic sympathetic (vasoconstrictor) fibers are unmyelinated type C fibers.
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