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Parasympathetic stimulation stimulates the muscarinic receptors (and nicotinic) leading to increased Salivation, Lacrimation, Urination, Defacation, increased Gastric motility, Emesis etc

Baroreceptors detect increased BP (vessel stretch) and increase vagal tone - > increase parasympathetic tone ->increase muscarinic stimualtion - > diuresis

Also consider the effect of Atrial Natruetic Peptide and its effect...

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