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NBME 23 Answers

nbme23/Block 3/Question#49

Genetic analyses of cells obtained on amniocentesis ...

Epinephrine

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 +4  upvote downvote
submitted by seagull(540),

Epinephrine is the only G coupled receptor activator the list. The rest are either inter-cellular or a tyrosine kinase (insulin).

hello  intracellular* correcting in case it trips someone up +1  




 +1  upvote downvote
submitted by krewfoo99(17),

Epinephrine acts mostly on Beta receptors. Beta receptors are G coupled.





 +0  upvote downvote
submitted by diabetes(4),

how is adrenal medulla has ACH nicotinic receptor which are ligand-gated Na/k channeles ? muscarinic ACH receptors are G-protein-coupled receptors.

gdupgrant  epinephrine acts on alpha or beta adrenergic receptors which are all G protien receptors. muscarinic receptors are also G coupled but Acetyl choline wasnt an answer choice. In the adrenal medulla the chromaffin cells are kinda like modified post ganglionic neurons and have nicotinic receptors. +