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Multiple Choice Quiz
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1

Which of the following is correct and important for determining stimulus intensity?
A)The magnitude of receptor potentials increases with increasing stimulus intensity.
B)The frequency of receptor potentials increases with increasing stimulus intensity.
C)The magnitude of action potentials increases with increasing stimulus intensity.
D)The frequency of action potentials in second-order neurons in the ascending pathway increases as a result of recruitment of nearby receptor units.
E)A and D.
2

Lateral inhibition of somatosensory information
A)is most pronounced in areas of the skin where sensory units have the most overlapping of receptive fields.
B)allows for amplification of the intensity of a stimulus.
C)allows for the precise localization of a stimulus.
D)A and B.
E)A and C.
3

Accommodation responses for near vision
A)include increased sympathetic stimulation of iris smooth muscle.
B)include relaxation of ciliary muscles to allow rounding of the lens.
C)include increased parasympathetic stimulation of the ciliary muscles.
D)are inhibited by application of acetylcholine agonists to the eye.
E)are described by all of the above.
4

Which of the following statements about photoreceptors is not correct?
A)Rods are more sensitive than cones.
B)There are more rods than cones in the retina.
C)Cone vision is of higher acuity than rod vision.
D)There are three different cone types but only one type of rod.
E)Rods are found primarily in the fovea while cones are more scattered throughout the retina.
5

Information on the type of a given stimulus is provided by the specific sensitivity of individual receptors and by the specific pathways conveying information to the primary sensory areas.
A)True
B)False
6

In general, the larger the receptive field of a given sensory neuron and the lesser the degree of overlap among adjacent sensory fields, the greater the precision of locating the stimulus.
A)True
B)False
7

The ability to discriminate between two adjacent stimuli is greatest in the back, thigh, and forearm.
A)True
B)False
8

A somatosensory map of the left side of the body is present in the parietal lobe of the right side of the brain.
A)True
B)False
9

The dorsal columns of the spinal cord carry information about joint position and vibration to the somatosensory cortex.
A)True
B)False
10

The conduction of information regarding a painful stimulus can be inhibited by electrical stimulation of certain areas of the CNS that release endorphins.
A)True
B)False
11

The majority of the fibers in the optic nerve project to the suprachiasmatic nucleus, which relays information from the retina to the visual cortex.
A)True
B)False
12

The two parts of the eye most important for focusing an image on the retina are the lens and the iris.
A)True
B)False
13

An important function of the bones of the inner ear is to amplify sound waves.
A)True
B)False
14

Information on the loudness of a sound is conveyed by the frequency of action potentials in specific afferent fibers of the cochlear nerve.
A)True
B)False
15

The receptors for both sound and changes in head position are hair cells.
A)True
B)False
16

The primary sensory area of the brain for the sense of taste is found in the limbic system.
A)True
B)False
17

Processing of sensory information becomes more complex as the information is conveyed from one primary sensory area of the cortex to another.
A)True
B)False
18

18. Which of the following is not true about olfaction:
A)the odor of a substance is not related to its chemical structure
B)olfactory receptor neurons are the first cells in the pathway that gives rise to the sense of smell.
C)Olfactory neurons live for approximately 2 months.
D)Axons of the olfactory receptor cells synapse in the olfactory bulbs.
19

Nociceptors:
A)respond to painful stimuli
B)respond to excessive heat
C)are free nerve endings without any form of specialization
D)respond to chemicals secreted by cells of the immune system
E)all of the above





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