Parasympathetic activation of the uterus results in which vascular change?

• A. Vasodilation
• B. Vasoconstriction
• C. No change
• D. Lymphedema

Answer: (C)

Parasympathetic input to the uterus does not significantly alter the diameter of uterine blood vessels. The uterine vasculature is primarily controlled by sympathetic vasomotor activity, which can constrict vessels, and by local and hormonal factors that regulate blood flow. Parasympathetic signals to the uterine vessels are minimal and don’t produce a strong vasodilatory or other notable vascular change, so there is effectively no change in vascular tone with parasympathetic activation. Lymphedema isn’t an immediate vascular diameter response, so it isn’t the expected outcome.