In the study of medicine, histamine is an organic nitrogenous compound which is involved in local immune responses. It also regulates physiological function in the gut and acts as a neurotransmitter for the brain, spinal cord and uterus.
True
False
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H1
H2
H3
H4
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True
False
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Ligand-gated ion channels
GPCR
Channel-linked receptors
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True
False
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True
False
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H1
H2
H3
H4
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H1
H2
H3
H4
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True
False
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They are autocoids
They are distantly acting hormones
They mediate immediate allergic reactions
They function as a neurotransmitter
They regulate gastric acid secretions
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True
False
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True
False
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True
False
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True
False
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They are found in smooth muscle
They are Gs coupled
They cause elevation in IP3, Ca2+, and diacylglycerol
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True
False
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H1
H2
H3
H4
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True
False
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H1
H2
H3
H4
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True
False
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Diphenhydramine
Fexofenadine
Loratidine
Pyrilamine
Cetirizine
Promethazine
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Sedation
Dry mouth
Blurred vision
Urinary excretion
Increased GI motility
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They bind to the same receptor as histamine
They are bronchoconstrictors
They are vasodilators
They are inhibitors of degranulation
None of the above are true
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Decrease in BP
Headache
Edema
Heat, redness and local swelling
Urticaria or hives
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Antihistamines
Phenylephrine
Pseudoephedrine
Oxymetazoline
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Vesicular granules of mast cells or basophils
Neuronal tissue in the brain
Enterochromaffin-like cells in teh fundus of the stomach
Venoms
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Type II Allergic reactions
Venoms
Toxins
Radiation
Warm temperatures
Some drugs
Mechanical injury
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Sedation
Increased and thickened secretions
Increased heart rate
Reversal of histamine-induced vasodilation
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