BIO 225 EVALUATION EXAMS 2 UPDATED
QUESTIONS AND ANSWERS SURE A+
✔✔phasic receptors - ✔✔sensory receptors that adapt quickly to a constant stimulus;
respond STRONGLY at first (when stimulus begins) but then stop firing if the stimulus
continues unchanged
✔✔hyperpolarization - ✔✔What would deflection of the stereocilia toward the left
cause?
✔✔Horizontal cells - ✔✔What kind of cells in the mammalian retina mediate lateral
inhibition
✔✔potential - ✔✔Sensory systems work in the same general way: transduction of an
incoming stimulus into changes in the membrane
a. refractory period
b. fluidity
c. potential
d. capacitance
✔✔bitter, sweet, umami - ✔✔Which gustatory sensation(s) involve PLC converting
POP2 to IP3
, ✔✔never; unless they are destroyed or damaged, mammalian hair cells are never fully
inactive and always have resting, baseline activity - ✔✔When are mammalian hair cells
inactive?
✔✔afferent sensory neuron - ✔✔What are hair cells connected to?
a. interneuron
b. afferent sensory neuron
c. efferent sensory neuron
✔✔afferent neuron - ✔✔Type of neuron that carries incoming information from sensory
receptors to the brain or spinal cord (ex sensory neuron)
✔✔efferent neuron - ✔✔type of neuron that carries info FROM the CNS/integration
center to effectors (ex motor neurons)
✔✔absorbs excess light to prevent scattering or glare - ✔✔What is the function of the
choroid?
✔✔cAMP, Na+, Ca2+, ATP, Cl- - ✔✔What are all of the ions/molecules involved in
odorant receptor neurons?
✔✔light - ✔✔What do opsins recognize?
✔✔opsins - ✔✔a light-sensitive protein found in the photoreceptor cells of the retina that
aid in the detection of light in living organisms
✔✔rhodopsin (rods) and photopsins (cones) - ✔✔What are the two key types of opsins
and where are they located?
✔✔the opening of cAMP-gated ion channel - ✔✔When an odorant G-protein-coupled
receptor binds to an odorant, what directly initiates the depolarization of the membrane?
✔✔False - ✔✔True or False: a larger receptive field is more sensitive to touch.
✔✔True - ✔✔True or False: Generally, a particular neuron is associated with a certain
receptor.
✔✔True - ✔✔True or False: By having receptive fields overlap, the body is able to
better discriminate stimulus location.
✔✔polymodal receptors - ✔✔sensory receptors that respond to more than one class of
stimulus
QUESTIONS AND ANSWERS SURE A+
✔✔phasic receptors - ✔✔sensory receptors that adapt quickly to a constant stimulus;
respond STRONGLY at first (when stimulus begins) but then stop firing if the stimulus
continues unchanged
✔✔hyperpolarization - ✔✔What would deflection of the stereocilia toward the left
cause?
✔✔Horizontal cells - ✔✔What kind of cells in the mammalian retina mediate lateral
inhibition
✔✔potential - ✔✔Sensory systems work in the same general way: transduction of an
incoming stimulus into changes in the membrane
a. refractory period
b. fluidity
c. potential
d. capacitance
✔✔bitter, sweet, umami - ✔✔Which gustatory sensation(s) involve PLC converting
POP2 to IP3
, ✔✔never; unless they are destroyed or damaged, mammalian hair cells are never fully
inactive and always have resting, baseline activity - ✔✔When are mammalian hair cells
inactive?
✔✔afferent sensory neuron - ✔✔What are hair cells connected to?
a. interneuron
b. afferent sensory neuron
c. efferent sensory neuron
✔✔afferent neuron - ✔✔Type of neuron that carries incoming information from sensory
receptors to the brain or spinal cord (ex sensory neuron)
✔✔efferent neuron - ✔✔type of neuron that carries info FROM the CNS/integration
center to effectors (ex motor neurons)
✔✔absorbs excess light to prevent scattering or glare - ✔✔What is the function of the
choroid?
✔✔cAMP, Na+, Ca2+, ATP, Cl- - ✔✔What are all of the ions/molecules involved in
odorant receptor neurons?
✔✔light - ✔✔What do opsins recognize?
✔✔opsins - ✔✔a light-sensitive protein found in the photoreceptor cells of the retina that
aid in the detection of light in living organisms
✔✔rhodopsin (rods) and photopsins (cones) - ✔✔What are the two key types of opsins
and where are they located?
✔✔the opening of cAMP-gated ion channel - ✔✔When an odorant G-protein-coupled
receptor binds to an odorant, what directly initiates the depolarization of the membrane?
✔✔False - ✔✔True or False: a larger receptive field is more sensitive to touch.
✔✔True - ✔✔True or False: Generally, a particular neuron is associated with a certain
receptor.
✔✔True - ✔✔True or False: By having receptive fields overlap, the body is able to
better discriminate stimulus location.
✔✔polymodal receptors - ✔✔sensory receptors that respond to more than one class of
stimulus
