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bio 251 exam 2 questions and answers
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bio 251 exam 2 questions and answersWhich of the following is part of the autonomic nervous system?
a) parasympathetic nervous
b) sympathetic nervous system
c) somatic nervous system
d) bothaandb
e) all of the above - Answer- d
The part of the brain that is the critical link between the nervous and endocrine systems is
a) The brain stem
b) The cerebellum
c) The cerebral cortex
d) The hypothalamus
e) The basal nuclei - Answer- d
The cerebellum is involved in
a) coordination of voluntary muscle activity
b) coordination of slow sustained movement
c) crude awareness of sensation
d) all the above
e) bothaandb - Answer- a
Which of the following is most involved in generating emotions?
a) Brain stem
b) Cerebellum
c) Hypothalamus
d) Thalamus
e) Limbic system - Answer- e
Tight junctions between capillary endothelial cells in the central nervous system create the blood- brain barrier, thereby restricting the ________ molecules into the brain.
a) transcytosis of
b) active transport of
c) facilitated diffusion of hydrophobic
d) diffusion of hydrophilic
e) diffusion of lipophilic - Answer- d
Which of the following statements about simple spinal reflexes is true? a) The afferent neuron must synapse with an efferent neuron
b) Only excitatory neurons are used in reflex pathways
c) More than one efferent neuron can be activated as part of the reflex
d) Both a and b are true
e) Both b and c are true - Answer- c
Information from chemoreceptors on your tongue is sent to the CNS via
a) A visceral afferent
b) A sensory afferent
c) A somatosensory afferent
d) A sensory efferent
e) A visceral efferent - Answer- b
Conversion of stimulus energy into an action potential is called
a) Tonic response
b) Phasic response
c) Transduction
d) Receptor potential
e) Graded potential - Answer- c
9. Fast adapting (also called phasic) receptors
a) Show a decline in membrane potential as a stimulus continues
b) Show an increase in membrane potential as a stimulus continues
c) Continue to produce action potentials as a stimulus continue
d) Do not respond to stimuli
e) Both b and c are true - Answer- a
10. Which of the following is the best description of sweet taste bud receptor function?
a) Membrane receptors on sweet taste buds bind glucose or other sugars, which initiates a G protein
system, which ultimately causes K+ channels to close, which thereby hyperpolarizes the
membrane.
b) Membrane receptors on sweet taste buds bind glucose or other sugars, which closes the K+
channels, which ultimately initiates a G protein system, which thereby depolarizes the membrane.
c) Membrane receptors on sweet taste buds bind glucose or other sugars, which initiates a G protein system, which ultimately causes K+ channels to close, which thereby depolarizes the membrane.
d) Membrane receptors on sweet taste buds bind acids (H+), which initiates a G protein system, which ultimately causes K+ channels to close, which thereby depolarizes the membrane.
e) Membrane receptors on sweet taste buds bind glucose or other sugars, which hy - Answer- c
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