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Action of Histamine - Diponegoro University | Institutional Repository (UNDIP-IR) Action of Histamine

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H1-receptors

H1-&H2-receptors

H2-receptors

EXOCRINE EXCRETION

Increased production of nasal &

bronchial mucus, resulting in respiratory symptoms

BRONCHIAL SMOOTH MUSCLE

Constriction of bronchioles

results in symptoms of asthma,

decreased lung capacity

CARDIOVASCULAR SYSTEM

Lowers blood pressure by reducing

peripheral resistance.

Causes positive chronotropism

(mediated by H2 receptors) and a

positive inotropism (mediated by both

H1 & H2 receptors)

INTESTINAL SMOOTH MUSCLE

Constriction results in intestinal

cramps and diarrhea

SENSORY NERVE ENDINGS

Cause itch and pain

SKIN

Dilation & increased permeability of the capillaries results in leakage of proteins and fluid into the tissues. In the skin this results in the classical

“triple responses” (wheal formation,

reddening due to local vasodilation, & flare) / “halo”

STOMACH

Stimulation of gastric

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