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It doesn't atropine only acts on muscarinic receptors (it's a competitive antagonist here for ACh), but histamine acts on different receptors (histamine receptors). There is no direct interaction between atropine and histamine receptors
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∙ 12y ago
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Does atropine block only nicotinic receptors?
Atropine does not only block nicotinic receptors but also acetylcholine at muscarinic receptors
Why atropine has no effect on blood pressure?
The muscarinic receptors in the vasculature are not inneravated by the parasympathetic nervous system. Therefore, atropine binds to these receptors, but causes no response since it is a pure muscarinic antagonist.
What are the muscarinic receptors blockers?
Atropine
Myasthenia gravis why is atropine given?
it affects the receptors
What are Agonist and antagonist of muscarinic receptors?
Agonist is muscarine and antagonist is atropine.
Factors controlling secretion of the stomach?
The parietal cell in the stomach secrets gastric acid, which is hydrochloric acid (HCl). The Secretion of HCl by the parietal cell is stimulated by receptors for acetylcholine (muscarinic), histamine, and gastrin. The enterochromaffin cells (ECL) also have gastrin receptors and muscarinic receptors. ECL cells release histamine which reacts with H2 receptors (histamine 2 receptors) on parietal cells. Somatostatin is released by delta cells and decreases histamine release by ECL cells.
Why are histamine antagonists recommended for heart burn?
Histamine receptors in the stomach control acid production, and blocking them reduces acidity. The H2 receptors in the stomach are treated with different agents than the H1 receptors in the brain, there is little overlap.
Does epinephrine affect the muscarinic receptors?
No. Muscarinic receptors are affected by acetylcholinergic neurotransmitters (ie. muscarine, atropine). Only the parasympathetic nervous system have muscarinic receptors. Epinephrine affects adrenergic receptors (symapthetic nervous system).
How does ranitidine work?
Ranitidine (Zantac) is an H2 blocker. Histamine is released by nerves to the stomach and bind to H2 receptors to signal the stomach to make acid. Ranitidine blocks this interactions and so decreases acid production. The drugs called "antihistamines" block the H1 histamine receptors so that histamine (the same chemical) released by immune cells can't interact with other immune cells to cause allergies.
Will pilocarpine reverse effect of atropine?
yes
How does Histamine affect the bronchioles?
http://www.pharmacorama.com/en/Sections/Acetylcholine_2_2.php#5Acetylcholine is a bronchoconstrictor.
Why does atropine cause tachycardia?
Check out the atropine page at wikipedia.org for your answer.
