PNB 2264 Exam 3 Questions with
Correct Answers
Which of these occurs when light strikes photoreceptors? - Answer- the concentration of
cGMP inside photoreceptors decreases.
Color transduction relies upon the ___; color perception relies upon ___. - Answer-
cones; visual association cortex (V4)
Which of the following is the adequate stimulus for an individual simple cortical cell in
V1 (primary visual cortex) - Answer- a bar of light oriented at a specific angle
In contrast to autonomic neurons, somatic neurons ___ - Answer- are only excitatory
Which of the following is true about the cerebellum? - Answer- it compares the
movement in progress to the intended movement
a quick stretch (reflex hammer) to the quadriceps muscle activates ___ which synapse
___ with alpha motor neurons to the ___ - Answer- spindle afferents; directly;
quadriceps
when you step on a tack with your bare foot, the ___ programs the reflex that withdraws
the injured foot; the ___ programs the response that activates contralateral lower
extremity extensors - Answer- spinal cord; brain stem
The dorsal horn of the spinal cord contains ___ - Answer- synapses
The ability to precisely localize the origin of a stimulus is enhanced by ___ - Answer- all
of the above (overlapping receptive fields, small receptive fields, lateral inhibition wiring
(neurons) at synapse sites in ascending pathway
Which of the following types of sensory information would most likely activate a rapidly
adapting receptor? - Answer- vibration
The ___ is the MOTOR pathway concerned with sterognosis - Answer- lateral
corticospinal tract
Correct Answers
Which of these occurs when light strikes photoreceptors? - Answer- the concentration of
cGMP inside photoreceptors decreases.
Color transduction relies upon the ___; color perception relies upon ___. - Answer-
cones; visual association cortex (V4)
Which of the following is the adequate stimulus for an individual simple cortical cell in
V1 (primary visual cortex) - Answer- a bar of light oriented at a specific angle
In contrast to autonomic neurons, somatic neurons ___ - Answer- are only excitatory
Which of the following is true about the cerebellum? - Answer- it compares the
movement in progress to the intended movement
a quick stretch (reflex hammer) to the quadriceps muscle activates ___ which synapse
___ with alpha motor neurons to the ___ - Answer- spindle afferents; directly;
quadriceps
when you step on a tack with your bare foot, the ___ programs the reflex that withdraws
the injured foot; the ___ programs the response that activates contralateral lower
extremity extensors - Answer- spinal cord; brain stem
The dorsal horn of the spinal cord contains ___ - Answer- synapses
The ability to precisely localize the origin of a stimulus is enhanced by ___ - Answer- all
of the above (overlapping receptive fields, small receptive fields, lateral inhibition wiring
(neurons) at synapse sites in ascending pathway
Which of the following types of sensory information would most likely activate a rapidly
adapting receptor? - Answer- vibration
The ___ is the MOTOR pathway concerned with sterognosis - Answer- lateral
corticospinal tract
