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UMKC PHYSIOLOGY EXAM 1 2026
QUESTIONS AND ANSWERS| ACE
YOUR GRADES.
Changes in ____ and ____ membrane permeability produce ____
potentials - correct answer -Na+, K+, action
Voltage gated Na+ channel - correct answer -activation gate is
fast
Inactivation gate is slow
Action potentials are... - correct answer -ALL or NONE
Absolute refractory period - correct answer -second AP cannot be
generated because a large number of VG-Na+ channels are
inactivated
Relative refractory period - correct answer -a second AP can be
generated with a stronger stimulus (suprathreshold)
Some Na+ gates are inactive, some active
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Action potential conduction velocity depends on - correct answer -
1. Presence and degree of myelination
2. Diameter of the axon fiber
Myelin _____ conduction velocity - correct answer -increases
Myelin's role in action potentials - correct answer -add speed,
reduces metabolic cost, saves room in the NS because the axons
can have smaller diameter and still have increased conduction
velocity
Aps propagate by _______ ________. Action potentials are only
generated at ____ __ _______ - correct answer -saltatory
conduction, nodes of ranvier
Demyelination - correct answer -the loss of myelin prevents
neuron from conducting nerve impulses
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Chemical synapses all for _____directional communication -
correct answer -uni
Sequence of events at chemical synapses - correct answer -1.
Action potential reaches terminal
2. Ca2+ channels open
3. Calcium enters axon terminal
4. Neurotransmitter is released and diffuses into the cleft
5. Neurotransmitter binds to postsynaptic receptors
6. Neurotransmitter removed from synaptic cleft
Nicotinic ACH receptor
Glycine receptor
Gabaa receptor
NMDA
AMPA - correct answer -ionotropic receptors
Muscarinic ACH receptor
Alpha1, alpha2, B1, B2, B3 adrenergic receptors
Dopamine receptors
Gabab receptor - correct answer -metabotropic receptors
UMKC PHYSIOLOGY EXAM 1 2026
QUESTIONS AND ANSWERS| ACE
YOUR GRADES.
Changes in ____ and ____ membrane permeability produce ____
potentials - correct answer -Na+, K+, action
Voltage gated Na+ channel - correct answer -activation gate is
fast
Inactivation gate is slow
Action potentials are... - correct answer -ALL or NONE
Absolute refractory period - correct answer -second AP cannot be
generated because a large number of VG-Na+ channels are
inactivated
Relative refractory period - correct answer -a second AP can be
generated with a stronger stimulus (suprathreshold)
Some Na+ gates are inactive, some active
, Page | 2
Action potential conduction velocity depends on - correct answer -
1. Presence and degree of myelination
2. Diameter of the axon fiber
Myelin _____ conduction velocity - correct answer -increases
Myelin's role in action potentials - correct answer -add speed,
reduces metabolic cost, saves room in the NS because the axons
can have smaller diameter and still have increased conduction
velocity
Aps propagate by _______ ________. Action potentials are only
generated at ____ __ _______ - correct answer -saltatory
conduction, nodes of ranvier
Demyelination - correct answer -the loss of myelin prevents
neuron from conducting nerve impulses
, Page | 3
Chemical synapses all for _____directional communication -
correct answer -uni
Sequence of events at chemical synapses - correct answer -1.
Action potential reaches terminal
2. Ca2+ channels open
3. Calcium enters axon terminal
4. Neurotransmitter is released and diffuses into the cleft
5. Neurotransmitter binds to postsynaptic receptors
6. Neurotransmitter removed from synaptic cleft
Nicotinic ACH receptor
Glycine receptor
Gabaa receptor
NMDA
AMPA - correct answer -ionotropic receptors
Muscarinic ACH receptor
Alpha1, alpha2, B1, B2, B3 adrenergic receptors
Dopamine receptors
Gabab receptor - correct answer -metabotropic receptors
