Bio 2050 - Anatomy and Physiology » Fall 2020 » RTS Chapter 12

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Question #1
A graph of an EPSP would plot time against a voltage trace that would resemble
A.   a hill where the high point approaches the threshold value.
B.   a hill where the high point is the farthest away from the threshold value.
C.   a valley where the low point is the farthest away from the threshold value.
D.   a valley where the low point approaches the threshold value.
Question #2
Voltage-gated sodium channels at a neuron's initial segment are triggered to open when the membrane becomes more positive.
A.   FALSE
B.   TRUE
Question #3
In order to trigger the release of neurotransmitter from a neuron terminal, calcium ions
A.   exit the synaptic knob through diffusion.
B.   bind to ion channels on the neuron membrane and cause them to open for the transmitter.
C.   penetrate the synaptic vesicles and bind to molecules of neurotransmitter.
D.   bind to proteins on the surface of synaptic vesicles.
Question #4
When a neuromodulator slows the reuptake of a neurotransmitter or causes expression of an increased number of receptors on postsynaptic neurons, the effect is called
A.   facilitation.
B.   spatial summation.
C.   temporal summation.
D.   recruitment.
E.   presynaptic potentiation.
Question #5
Hyperpolarization of a neuron results from
A.   the entrance of either sodium or potassium.
B.   either the entry of a cation or the exit of an anion.
C.   the entry of any ion.
D.   either the entry of an anion or the exit of a cation.
Question #6
When multiple presynaptic neurons release neurotransmitter at various locations onto the postsynaptic neuron at the same time, this results in
A.   spatial summation.
B.   several action potentials.
C.   suprathreshold hyperpolarization.
D.   temporal summation.
Question #7
The conductive segment of a neuron is its ________, a region that contains many ________ gated channels.
A.   dendrite, chemically
B.   dendrite, voltage-
C.   axon, chemically
D.   axon, voltage-
Question #8
A graded potential is one that
A.   travels the length of the nerve fiber (is long-distance).
B.   lasts for several seconds after ion channels have opened, closed, and reset.
C.   is all or none (always the same intensity).
D.   varies in size depending on the magnitude of the stimulus (larger voltage change for stronger stimulus).
Question #9
A neuron's membrane contains more potassium leak channels than sodium leak channels.
A.   FALSE
B.   TRUE
Question #10
Which occurs first?
A.   Relative refractory period
B.   Absolute refractory period
Question #11
The size of an EPSP is independent of the amount of excitatory neurotransmitter that is released by the presynaptic cell.
A.   TRUE
B.   FALSE
Question #12
According to Ohm's law, current is
A.   inversely related to both voltage and resistance.
B.   directly related to voltage and inversely related to resistance.
C.   indirectly related to voltage and directly related to resistance.
D.   directly related to both voltage and resistance.
Question #13
Receptors are parts of the nervous system that allow it to
A.   collect information.
B.   conduct impulses to muscles.
C.   process information.
D.   initiate responses to information.
Question #14
The portion of the nervous system that has voluntary control over skeletal muscles is the ________ division.
A.   somatic motor
B.   visceral sensory
C.   somatic sensory
D.   autonomic motor
Question #15
What do all glial cells have in common?
A.   They transfer blood to the various neurons.
B.   They help to transmit the nerve signals.
C.   They absorb extra blood and cerebrospinal fluid.
D.   They all attack pathogens.
E.   They assist neurons in their respective functions.
Question #16
Fast axonal transport is
A.   active (requires ATP) and can occur in either the anterograde or retrograde direction.
B.   passive and only occurs in the anterograde direction.
C.   passive and only occurs in the retrograde direction.
D.   active (requires ATP) and only occurs in the retrograde direction.
E.   active (requires ATP) and only occurs in the anterograde direction.
Question #17
The nervous system contains more neurons than glial cells.
A.   FALSE
B.   TRUE
Question #18
Continuous conduction of a nerve impulse occurs only along
A.   axons in the PNS.
B.   unmyelinated axons.
C.   myelinated axons.
D.   axons in the CNS.
E.   dendrites.
Question #19
Which part of the neuron contains the nucleus?
A.   Synaptic knob
B.   Dendrite
C.   Axon hillock
D.   Soma
E.   Axon
Question #20
A bipolar neuron has
A.   two axons extending from the cell body.
B.   two dendrites extending from the cell body.
C.   a single short process that extends from the cell body and then splits into a peripheral and a central branch.
D.   one axon and one dendrite extending from the cell body.

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