Stimulation of which receptor leads to bronchodilation?

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Multiple Choice

Stimulation of which receptor leads to bronchodilation?

Explanation:
Bronchodilation occurs when bronchial smooth muscle relaxes, and this is driven by stimulation of beta-2 adrenergic receptors on those airways. Activation of these receptors triggers a Gs protein pathway that increases cyclic AMP, leading to smooth muscle relaxation and widened airways. Other receptor types don't produce this effect: alpha-1 receptors mainly cause vasoconstriction; beta-1 receptors are mainly in the heart, affecting heart rate and contractility; and muscarinic receptors (on airway smooth muscle) promote bronchoconstriction.

Bronchodilation occurs when bronchial smooth muscle relaxes, and this is driven by stimulation of beta-2 adrenergic receptors on those airways. Activation of these receptors triggers a Gs protein pathway that increases cyclic AMP, leading to smooth muscle relaxation and widened airways.

Other receptor types don't produce this effect: alpha-1 receptors mainly cause vasoconstriction; beta-1 receptors are mainly in the heart, affecting heart rate and contractility; and muscarinic receptors (on airway smooth muscle) promote bronchoconstriction.

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