What is the effect of alpha-1 receptor stimulation?

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Multiple Choice

What is the effect of alpha-1 receptor stimulation?

Explanation:
Alpha-1 receptor stimulation causes contraction of smooth muscle, especially in vascular walls, leading to vasoconstriction and a rise in blood pressure due to increased systemic vascular resistance. This works through a Gq pathway that increases IP3 and intracellular calcium, driving smooth muscle contraction. This explains why alpha-1 activation raises blood pressure. By contrast, bronchodilation is a beta-2 effect, skeletal muscle vasodilation is mainly mediated by beta-2 and local factors, and heart rate changes are driven largely by beta-adrenergic receptors, not alpha-1.

Alpha-1 receptor stimulation causes contraction of smooth muscle, especially in vascular walls, leading to vasoconstriction and a rise in blood pressure due to increased systemic vascular resistance. This works through a Gq pathway that increases IP3 and intracellular calcium, driving smooth muscle contraction. This explains why alpha-1 activation raises blood pressure. By contrast, bronchodilation is a beta-2 effect, skeletal muscle vasodilation is mainly mediated by beta-2 and local factors, and heart rate changes are driven largely by beta-adrenergic receptors, not alpha-1.

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