Which of the following hormones causes constriction of vascular smooth muscle through an inositol 1,4,5-triphosphate (IP ${ }_{3}$ ) second messenger system?

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[Chapter 7, III C 1 b]. Antidiuretic hormone (ADH) causes constriction of vascular smooth muscle by activating a $V_{1}$ receptor that uses the inositol 1,4,5-triphosphate $\left(\mathrm{IP}_{3}\right)$ and $\mathrm{Ca}^{2+}$ second messenger system. When hemorrhage or extracellular fluid (ECF) volume contraction occurs, $\mathrm{ADH}$ secretion by the posterior pituitary is stimulated via volume receptors. The resulting increase in ADH levels causes increased water reabsorption by the collecting ducts ( $\mathrm{V}_{2}$ receptors) and vasoconstriction ( $\mathrm{V}_{1}$ receptors) to help restore blood pressure.

Which of the Following Hormones Causes Constriction of Vascular Smooth 3{ }_{3}3​

Which of the Following Hormones Causes Constriction of Vascular Smooth ${ }_{3}$