Question 1

Which of the following best explains why the perception of 'flavor' is more complex than the perception of 'taste' alone?

Accepted Answer

Flavor is a combination of taste, olfactory input, texture, and temperature.

Question 2

A patient presents with a loss of taste sensation (ageusia) on the anterior two-thirds of the tongue. Which cranial nerve is most likely affected?

Accepted Answer

Facial nerve (CN VII) via the chorda tympani

Question 3

Which of the following is TRUE regarding the mechanism of sweet taste transduction?

Accepted Answer

Sweet molecules bind to G-protein coupled receptors, leading to cAMP production and closure of potassium channels.

Question 4

Which of the following best describes the neural coding strategy used in gustation (taste)?

Accepted Answer

Taste sensation is determined by the population coding of nerve fibers activated by a stimulus.

Question 5

A person is unable to distinguish between the smells of lemon and orange, but can still detect their presence. Which aspect of olfactory function is most likely impaired?

Accepted Answer

Odor discrimination

Question 6

Which of the following is a requirement for a molecule to be an effective odorant?

Accepted Answer

It must be water-soluble, lipid-soluble, and volatile.

Question 7

Which of the following best describes the mechanism of olfactory transduction?

Accepted Answer

Odorant binds to a G-protein coupled receptor, activating adenylyl cyclase, increasing cAMP, which opens cation channels.

Question 8

Which papillae are arranged in a V-shaped row at the posterior part of the tongue and contain the largest number of taste buds per papilla?

Accepted Answer

Circumvallate papillae

Question 9

A person who cannot smell (anosmia) is likely to experience which of the following changes in taste perception?

Accepted Answer

A reduced ability to perceive the full range of flavors.

Question 10

Which of the following best explains why increasing the area of the tongue exposed to a taste stimulus decreases the threshold concentration required for detection?

Accepted Answer

A larger area increases the number of taste buds stimulated, enhancing sensitivity.

Question 11

Which of the following is TRUE regarding the adaptation of taste and olfactory receptors?

Accepted Answer

Olfactory receptors adapt rapidly, while taste receptors adapt more slowly.

Question 12

Which of the following best describes the pathway for taste sensation from the tongue to the cerebral cortex?

Accepted Answer

Taste receptor cells → cranial nerves → gustatory nucleus in medulla → VPM of thalamus → primary gustatory cortex

Question 13

Which of the following statements about taste cell turnover is correct?

Accepted Answer

Taste cells have a lifespan of only a few days and are regenerated from basal cells.

Question 14

Which of the following best explains why a person may have difficulty tasting an apple while smelling a banana?

Accepted Answer

Olfactory input can influence the perception of taste, leading to confusion between flavors.

Question 15

Which of the following is TRUE regarding the mechanism of sour taste transduction?

Accepted Answer

Hydrogen ions enter through amiloride-sensitive sodium channels and close potassium channels, leading to depolarization.

Question 16

Which of the following statements about the olfactory bulb is correct?

Accepted Answer

Mitral cells in the olfactory bulb receive input from olfactory nerve axons and send output via the olfactory tract.

Question 17

A patient with a genetic mutation affecting G-protein coupled receptors in the olfactory epithelium would most likely experience which of the following?

Accepted Answer

Impaired ability to detect a wide range of odors.

Question 18

Which of the following best describes the role of basal cells in the olfactory epithelium?

Accepted Answer

They function as stem cells, regenerating new olfactory receptor cells.

Question 19

Which of the following is a key difference between taste and olfactory receptor coding?

Accepted Answer

Both taste and olfaction use population coding, but olfaction relies more on spatial and temporal patterns.

Chemical Senses: Taste (Gustation) and Smell (Olfaction)

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