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Home Q & A Board Biology-Related Homework Help Medicine
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jshuo jshuo
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6 years ago
A nursing student asks why a direct-acting cholinergic agonist drug that is selective to muscarinic receptors is described as being non-specific. The nurse will explain that this is because
 
  a. muscarinic receptors are present in many different tissues.
  b. the action of cholinesterase alters the bioavailability at different sites.
  c. these drugs can also affect nicotinic receptors.
  d. they vary in their reversible and irreversible effects.
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#1
6 years ago
ANS: A
Although drugs classified as direct-acting cholinergic agonists are primarily selective for muscarinic receptors, they are non-specific because muscarinic receptors are located in different sites, causing actions in various organs. They are not affected differently by cholinesterase activity and have negligible actions on nicotinic receptors.
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