Question 1

Which of the following best describes the process of lateral inhibition in sensory pathways?

Accepted Answer

It enables precise localization of a stimulus by inhibiting signals from neurons at the edge of a stimulus, thereby enhancing contrast between the center and periphery.

Question 2

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

Accepted Answer

Convergence of visceral and somatic afferent neurons onto the same interneuron, resulting in referred pain.

Question 3

Which of the following statements about photoreceptors in the retina is CORRECT?

Accepted Answer

Photoreceptors undergo graded responses and communicate with bipolar cells via neurotransmitter release.

Question 4

A person with red-green color blindness most likely has which of the following genetic characteristics?

Accepted Answer

A recessive mutation on the X chromosome affecting cone pigments.

Question 5

Which of the following best explains why objects appear in shades of gray under dim lighting conditions?

Accepted Answer

Rods are activated in dim light but lack mechanisms for distinguishing between different wavelengths.

Question 6

A 65-year-old man experiences dizziness after rapid head movements, but not hearing loss or tinnitus. Which structure is most likely involved in his symptoms?

Accepted Answer

Vestibular apparatus (semicircular canals and otolith organs)

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 absence of input, and their glutamate receptors are inhibitory.

Question 8

Which of the following best describes the mechanism by which salty taste is detected?

Accepted Answer

Sodium influx through ion channels in taste receptor cells.

Question 9

Which of the following is a function of the vestibular system?

Accepted Answer

Maintaining upright posture and balance by detecting head position and acceleration.

Question 10

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

Accepted Answer

The olfactory mucosa is congested, preventing odorant molecules from reaching the olfactory epithelium.

Question 11

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

Accepted Answer

Cochlea → brainstem → thalamus → auditory cortex

Question 12

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

Accepted Answer

Pacinian corpuscle

Question 13

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

Accepted Answer

The conversion of stimulus energy into a signal that conveys relevant sensory information to the CNS.

Question 14

Which of the following is TRUE regarding the perception of color?

Accepted Answer

Color vision depends on the differential activation of three types of cones, each sensitive to different wavelengths.

Question 15

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

Accepted Answer

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

Question 16

Which of the following is the correct order of events in the ON-pathway of the retina when light strikes the photoreceptors?

Accepted Answer

Photoreceptors hyperpolarize → glutamate release decreases → ON-bipolar cells depolarize → ganglion cells are excited

Question 17

Which of the following diseases is characterized by increased intraocular pressure due to impaired drainage of aqueous humor?

Accepted Answer

Glaucoma

Question 18

Which of the following best describes the role of the association cortex in sensory processing?

Accepted Answer

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

Question 19

Which of the following is TRUE regarding the sense of smell (olfaction)?

Accepted Answer

Olfactory receptor neurons are bipolar cells that are constantly replaced from stem cells in the olfactory epithelium.

Question 20

Which of the following best explains why the sense of taste can be affected by a dry mouth?

Accepted Answer

Taste receptor cells require food molecules to be dissolved in liquid to enter taste pores and interact with receptors.

Chapter 7: Sensory Physiology – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards