Question 1

Which of the following best describes the process of sensory transduction?

Accepted Answer

The conversion of a stimulus into a graded potential in a sensory receptor.

Question 2

A patient reports feeling pain in his left arm during a heart attack. This phenomenon is best explained by which of the following?

Accepted Answer

Referred pain due to convergence of visceral and somatic afferent neurons onto the same spinal interneuron.

Question 3

Which of the following is a rapidly adapting mechanoreceptor responsible for detecting vibration and deep pressure in the skin?

Accepted Answer

Pacinian corpuscle

Question 4

Lateral inhibition in sensory pathways serves to:

Accepted Answer

Enhance contrast between the center and periphery of a stimulated region, improving localization of the stimulus.

Question 5

Which of the following best explains why objects appear in shades of gray at night rather than in color?

Accepted Answer

Rods are the only photoreceptors active in dim light and cannot distinguish between different wavelengths.

Question 6

A person with red-green color blindness most likely has:

Accepted Answer

A mutation in the genes encoding the red or green cone pigments on the X chromosome.

Question 7

Which of the following is TRUE regarding the ON- and OFF-pathways in the retina?

Accepted Answer

ON-pathway bipolar cells depolarize in the presence of light, while OFF-pathway bipolar cells depolarize in the absence of light.

Question 8

A 65-year-old man experiences dizziness after rapid head movements, but no hearing loss or tinnitus. Which structure is most likely involved in his symptoms?

Accepted Answer

Vestibular apparatus, specifically the semicircular canals

Question 9

Which of the following best describes the role of the thalamus in sensory processing?

Accepted Answer

It acts as a relay station, transmitting sensory information from the brainstem to the cerebral cortex.

Question 10

Which of the following is the correct sequence for the neural pathway of hearing from the cochlea to the auditory cortex?

Accepted Answer

Cochlear nerve → brainstem → thalamus → auditory cortex

Question 11

Which of the following best explains why a person with a head cold may have a reduced sense of smell?

Accepted Answer

Congestion of the olfactory mucosa impairs the diffusion of odorant molecules to the olfactory epithelium.

Question 12

Which of the following is TRUE regarding the detection of different taste modalities?

Accepted Answer

Salty taste is detected by sodium influx, while bitter taste is detected by G-protein-coupled receptor activation.

Question 13

Which of the following diseases is characterized by increased intraocular pressure and can lead to irreversible blindness?

Accepted Answer

Glaucoma

Question 14

Which of the following statements about the association cortex is correct?

Accepted Answer

It integrates sensory information with arousal, attention, memory, language, emotion, and motivation.

Question 15

Which of the following best describes the function of the vestibular system?

Accepted Answer

It provides information about head position and movement to help maintain balance and coordinate eye movements.

Question 16

Which of the following is a plausible explanation for why some drugs can alter sensory perception?

Accepted Answer

They can modify synaptic transmission in sensory pathways, altering the processing of sensory information.

Question 17

Which of the following is TRUE regarding the neural coding of stimulus intensity?

Accepted Answer

It is conveyed by both the frequency of action potentials and the number of sensory units activated.

Question 18

Which of the following best describes the mechanism of action for endogenous opioids in pain modulation?

Accepted Answer

They inhibit the transmission of pain signals by binding to opioid receptors in the central nervous system.

Question 19

Which of the following statements about the sense of itch is correct?

Accepted Answer

Itch is a distinct sensation with mechanisms that overlap but are separate from pain signaling pathways.

Question 20

Which of the following best explains why a person with a cataract experiences blurred vision?

Accepted Answer

Opacity of the lens scatters and blocks light, preventing proper focusing on the retina.

Chapter 07 - Sensory Physiology: Comprehensive Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards