Vasopressin can cause uterine smooth muscle contractions by binding weakly to which receptors?

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Study for the Vasopressors and Inotropes Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Vasopressin can cause uterine smooth muscle contractions by binding weakly to which receptors?

Explanation:
Vasopressin can cause uterine smooth muscle contractions by binding to V1 receptors on the myometrium. V1 receptors are Gq-coupled and, when activated, trigger the phospholipase C pathway leading to increased intracellular calcium and muscle contraction. Although the uterus is most responsive to oxytocin through oxytocin receptors, vasopressin can bind weakly to V1 receptors in the uterus and induce contractions, albeit less potently than oxytocin receptor activation. V2 receptors drive kidney water reabsorption, and dopamine receptors are not involved in this mechanism, so the relevant site for this effect is the V1 receptor.

Vasopressin can cause uterine smooth muscle contractions by binding to V1 receptors on the myometrium. V1 receptors are Gq-coupled and, when activated, trigger the phospholipase C pathway leading to increased intracellular calcium and muscle contraction. Although the uterus is most responsive to oxytocin through oxytocin receptors, vasopressin can bind weakly to V1 receptors in the uterus and induce contractions, albeit less potently than oxytocin receptor activation. V2 receptors drive kidney water reabsorption, and dopamine receptors are not involved in this mechanism, so the relevant site for this effect is the V1 receptor.

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