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Physio Psych Unit 2
Practice Questions
1. According to the calculations of
Hodgkin and Huxley, the force from
the concentration gradient driving K+
ions _______the neuron is ______ mV.
a)
b)
c)
d)
e)
in; 50
out of; 50
in; 70
out of; 90
none of the above
2. According to the calculations of
Hodgkin and Huxley, the force from
the electrostatic pressure driving Na+
ions _______the neuron is ______ mV.
a)
b)
c)
d)
e)
in; 50
out of; 50
in; 70
out of; 90
none of the above
3. According to the calculations of
Hodgkin and Huxley, the force from
the concentration gradient driving Clions _______the neuron is ______ mV.
a)
b)
c)
d)
e)
in; 50
out of; 50
in; 70
out of; 90
none of the above
4. Which of the following begins the repolarization (downward) phase of the
AP?
a)
b)
c)
d)
e)
Na+ channels close
K+ channels open
Na+ channels open
K+ channels close
Both A and B
5. In general, which type of receptor has
more diffuse, long-lasting effects?
a)
b)
c)
d)
e)
ionotropic
metabotropic
autobotropic
NMDA
cholinergic
6. Which of the following is NOT a
characteristic of string-of-beads
synapses.
a) contain varicosities
b) are nondirected synapses
c) release neurotransmitters directly on
a dendritic spine
d) all of the above
e) none of the above
7. Inhibition is to excitation as
____________.
a)
b)
c)
d)
e)
EPSPs are to IPSPs
APs are to PSPs
axodendritic is to axoaxonic
temporal is to spatial summation
none of the above
8. The influx of Cl- ions through a GABA
receptor _________________.
a)
b)
c)
d)
e)
causes a hyperpolarization
Is enhanced by benzodiazepine drugs
produces an IPSP
inhibits the neuron
all of the above
9. Which drug is a cholinergic nicotinic
antagonist at the neuromuscular
junction?
a)
b)
c)
d)
e)
f)
curare
botox
atropine
diazepam
Chlordiazepoxide
Both A and B
20. Which neurotransmitter is in a class
by itself?
a)
b)
c)
d)
e)
dopamine
glutamate
GABA
Glycine
acetylcholine
Answers
1) d
2) c
3) c
4) a
5) b
6) c
7) e
8) e
9) f
10) e