TEST BANK FINAL PROCTORED MULTIPLE CHOICE
EXAM 2026-2027 |NEWEST EXAM WITH COMPLETE
QUESTIONS AND ACCURATE DETAILED ANSWERS||
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In the presynaptic terminal of neuronal cells, the immediate trigger to
release a neurotransmitter from synaptic vesicles into the synaptic cleft
is
A) a drop in cytosolic Ca2+.
B) a drop in cytosolic K+.
C) a rise in cytosolic Ca2+.
D) a drop in cytosolic Mg2+.
E) a rise in cytosolic K+.
F) a rise in cytosolic Mg2+.
ANSWERS: C
,A 17-year-old girl with suspected intrinsic asthma but nearly normal results on
spirometry and flow volume testing takes a methacholine
provocative test. The mechanism of action of methacholine most closely
resembles that of
hemicholinium.
acetylcholine.
edrophonium.
succinylcholine.
neostigmine.
ANSWERS: B
,The muscarinic receptor that couples to G proteins responsible for adenylyl
cyclase inhibition and plays a key role in cholinergic input to the heart is
classified as
muscarinic-M1 receptor.
muscarinic-M2 receptor.
muscarinic-M3 receptor.
muscarinic-M4 receptor.
muscarinic-M5 receptor.
ANSWERS: B
, A 25-year old female presents with delirium, hyperthermia, and
symptoms of central anticholinergic intoxication. She has attended a
ìwitches' conventî and ingested some herbal extracts including fruits of the
species ìAtropa belladonna.î As one component of her treatment, she
receives a dose of physostigmine.
Refer to the case above. Physostigmine is preferred over neostigmine
because
A) it is a nonpolar compound that penetrates the CNS more easily than
neostigmine.
B) it has a shorter half-life than neostigmine, making it more useful for
emergency treatment.
C) it has a longer half-life than neostigmine, better matching the half-life of
atropine.
D) it is eliminated via the kidneys, and dosage is not critical with
compromised liver function.
E) it is eliminated via the liver, and dosage is not critical with
compromised renal function.
ANSWERS: A