Stimulation of the histamine (H₁) receptors often results in:

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Stimulation of histamine receptors, particularly H1 receptors, leads to vasodilation and increased vascular permeability, which causes local tissue swelling, redness, and warmth. It also plays a role in immune response and contributes to allergy symptoms such as itching, flushing, and hives. However, stimulation of H2 receptors can cause increased gastric acid release, while H3 receptors play a role in regulating neurotransmitter release, and H4 receptors are involved in immune system regulation. Stimulation of histamine receptors does not inhibit antibody production but can activate and recruit immune cells to the site of inflammation. While histamine can cause bronchoconstriction, this effect is primarily mediated through H2 receptors and is less important than the bronchodilatory effect of beta2-adrenergic agonists in treating respiratory conditions such as asthma.

Stimulation of the Histamine (H1) Receptors Often Results In

Stimulation of the Histamine (H₁) Receptors Often Results In