Question 1

Which of the following best describes the initial step in olfactory signal transduction after an odorant binds to its receptor on the olfactory cilia?

Accepted Answer

The odorant activates a G protein, which then stimulates adenylate cyclase to produce cAMP.

Question 2

A patient with damage to the cribriform plate of the ethmoid bone is most likely to experience which of the following symptoms?

Accepted Answer

Impaired olfactory signal transmission from the nasal cavity to the olfactory bulb

Question 3

Which cranial nerve is primarily responsible for transmitting taste sensations from the posterior one-third of the tongue?

Accepted Answer

Glossopharyngeal nerve (IX)

Question 4

What is the main function of basal cells in the olfactory epithelium?

Accepted Answer

They act as progenitor cells, regenerating olfactory receptor neurons.

Question 5

Which of the following best explains why a stuffy nose can diminish the perception of flavor?

Accepted Answer

Olfactory input is reduced, which significantly contributes to the overall perception of flavor.

Question 6

Which of the following taste modalities is most directly associated with the detection of amino acids such as glutamate?

Accepted Answer

Umami

Question 7

A mutation in the T1R1 gene in pandas affects their ability to detect which taste modality, and what is the likely dietary consequence?

Accepted Answer

Umami; reduced preference for meat and increased reliance on bamboo

Question 8

Which of the following statements about the neural pathway for taste is correct?

Accepted Answer

Taste signals are relayed through the solitary nucleus in the medulla before reaching the thalamus and then the gustatory cortex.

Question 9

Which of the following best describes the mechanism of salty taste transduction?

Accepted Answer

Na+ ions enter gustatory cells through ENaC or TRPV1 channels, causing depolarization.

Question 10

Which of the following is a unique feature of the olfactory pathway compared to other sensory systems?

Accepted Answer

It projects directly to the primary sensory cortex without first synapsing in the thalamus.

Question 11

A researcher applies a bitter compound to the tongue and observes activation of a G protein-coupled receptor (GPCR) pathway. Which of the following is the most likely sequence of events?

Accepted Answer

GPCR activation → phosphoinositide pathway → increased intracellular Ca2+ → depolarization

Question 12

Which of the following best explains the role of the olfactory bulb in odor discrimination?

Accepted Answer

It integrates and refines olfactory signals by converging input from receptor neurons expressing the same receptor type onto specific glomeruli.

Question 13

Which of the following is true regarding the regeneration of sensory receptor cells in the olfactory and gustatory systems?

Accepted Answer

Olfactory receptor neurons regenerate every 4-8 weeks, while gustatory cells regenerate every 7 days.

Question 14

A person is unable to distinguish between sweet, bitter, and umami tastes but can still detect salty and sour. Which type of gustatory cell is most likely dysfunctional?

Accepted Answer

Type II cells

Question 15

Which of the following best describes the role of the amygdala in olfactory processing?

Accepted Answer

It integrates olfactory information with emotional responses and memory.

Question 16

Which of the following statements about the distribution of taste buds is correct?

Accepted Answer

Taste buds are located mostly in papillae on the tongue, including fungiform, circumvallate, and foliate papillae.

Question 17

Which of the following best explains why the olfactory system can detect such a wide variety of odors?

Accepted Answer

There are approximately a thousand different olfactory receptor molecules, each sensitive to different odorants.

Question 18

Which of the following is the correct sequence for the neural pathway of taste from the tongue to the cortex?

Accepted Answer

Taste bud → cranial nerve → solitary nucleus → thalamus → gustatory cortex

Question 19

Which of the following ions is primarily responsible for the depolarization of gustatory cells in response to salty stimuli?

Accepted Answer

$$\mathrm{Na^+}$$

Physiology of Smell and Taste: Structure, Function, and Neural Pathways

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