What do muscarinic M3 receptors do?

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Multiple Choice

What do muscarinic M3 receptors do?

Explanation:
Muscarinic M3 receptors are Gq-coupled and drive pathways that lead to calcium signaling. In the periphery, this directly stimulates glandular secretion, so activating M3 receptors increases salivary gland secretion. In the brain, their influence on dopamine is more indirect and can result in a net decrease in dopamine release in certain circuits, due to how the excitatory and inhibitory networks interact when M3 is engaged. So the overall effect of M3 receptor activation is to boost salivary secretion while reducing dopamine release in the relevant CNS pathways. This fits the option describing increased salivary secretion and decreased dopamine release.

Muscarinic M3 receptors are Gq-coupled and drive pathways that lead to calcium signaling. In the periphery, this directly stimulates glandular secretion, so activating M3 receptors increases salivary gland secretion. In the brain, their influence on dopamine is more indirect and can result in a net decrease in dopamine release in certain circuits, due to how the excitatory and inhibitory networks interact when M3 is engaged. So the overall effect of M3 receptor activation is to boost salivary secretion while reducing dopamine release in the relevant CNS pathways. This fits the option describing increased salivary secretion and decreased dopamine release.

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