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Bio 252 Final Exam – Questions With Expert Verified Solutions
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Bio 252 Final Exam – Questions With Expert VerifiedSolutions
The neuron cannot respond to a second stimulus, no matter how strong
Right Ans - absolute refractory period
the specific period during which potassium ions diffuse out of the neuron due
to a change in membrane permeability Right Ans - repolarization
Also called a nerve impulse transmitted by axons Right Ans - action
potential
The interior of the cell becomes less negative due to an influx of sodium ions.
Right Ans - depolarization
Voltage-gated Na+ channels open Right Ans - depolarization
Na+ channels are inactivating, and voltage-gated K+ channels open. Right
Ans - repolarization
Some K+ channels remain open and Na+ channels reset Right Ans -
hyperpolarization
Any stimulus at or above this level will result in action potential. Right Ans
- threshold stimulus
Auditory area Right Ans - temporal lobe
Primary somatosensory cortex Right Ans - parietal lobe
Primary (somatic) motor cortex Right Ans - frontal lobe
Nerve impulses are sent to slow the heart's rate of contraction. The nerve
fibers sending these signals will most likely belong to which division of the
nervous system? Right Ans - parasympathetic divison
Nerve impulses leading to the brain carry information about cool
temperatures on the skin. The nerve fibers sending these signals will most
,likely belong to which division of the nervous system? Right Ans - sensory
(afferent) divisons
Nerve impulses leading to the skeletal muscle carry information to direct
movement. the nerve fibers sending these signals will most likely belong to
which division of the nervous system? Right Ans - somatic nervous system
Cranial nerves II the optic nerve sends nerve impulses to the brain carrying
information about things we see. these nerve fibers most likely belong to
which division of the nervous system? Right Ans - sensory(afferent)
divison
The concentration of ions in the chemical environment surrounding the
neurons must be tightly regulated for neurons to function properly. Which of
the following cells is most responsible for this? Right Ans - astrocytes
Some nerve fibers of the peripheral nervous system have the ability to
regenerate after damage has occurred. Which of the following cells is most
responsible for aiding in this regulation? Right Ans - Schwann cells
Meningitis can be caused by infection of the central nervous system by
bacteria. Which cells would be most responsible for removing the infection?
Right Ans - microglia
If a postsynaptic neuron is stimulated to threshold by spatial summation this
implies that ________. Right Ans - the postsynaptic cell has many synapses
with many presynaptic neurons
If a postsynaptic cell is stimulated to threshold by temporal summation this
implies that ________. Right Ans - a presynaptic neuron is sending frequent
EPSP
When a neurotransmitter like acetylcholine is acting in an excitatory manner
which of the following is likely a result of the acetylcholine acting on the post
synaptic cell? Right Ans - chemically gated sodium channel will open
Which of the following is NOT a function of dendrites Right Ans - generate
nerve impulses and transmit them away from the cell body
, These cells in the CNS have cilia that move in order to circulate cerebrospinal
fluid ________. Right Ans - ependymal cells
The period after an initial stimulus when a neuron is not sensitive to another
stimulus is the Right Ans - absolute refractory period
Which ion channel opens in response to a change in membrane potential and
participates in the generation and conduction of action potentials? Right
Ans - voltage-gated channel
Which of the following is NOT a function of the autonomic nervous system?
Right Ans - innervation of skeletal muscle
Collections of nerve cell bodies outside the central nervous system are called
________. Right Ans - ganglia
The term central nerves system refers to the Right Ans - brain and spinal
cord
A neuron that has as its primary function the job of connecting other neurons
is called an Right Ans - interneuron
Saltatory conduction is made possible by ________. Right Ans - myelin sheath
Schwann cells are functionally similar to ________. Right Ans -
oligodendrocytes
Immediately after an action potential has peaked which of the following
channels will open Right Ans - voltage-gated potassium channels
The interior surface of neuron plasma membrane at resting membrane
poetical will have a Right Ans - negative charge and contains less sodium
than outside of the cell
Which brain structure functions to control the autonomic nervous system and
to regulate body temperature Right Ans - hypothalamus
Nuclei of cranial nerves V, VI, and VII are found in the ________. Right Ans -
pons
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