Q: Which equation best represents the process of taste transduction for salty taste?

$$\mathrm{Na^+}$$ influx \rightarrow \text{depolarization of gustatory epithelial cell}$

Question 1

Which of the following best explains why color blindness is more common in males than females?

Accepted Answer

Color blindness is an X-linked recessive condition, and males have only one X chromosome.

Question 2

A patient presents with night blindness. Which of the following is the most likely underlying cause?

Accepted Answer

Degeneration of rod cells due to prolonged vitamin A deficiency.

Question 3

Which statement correctly compares rods and cones in the retina?

Accepted Answer

Cones are responsible for color vision and are mostly found in the central retina.

Question 4

Which visual pigment is found only in rods and is responsible for noncolor vision?

Accepted Answer

Rhodopsin

Question 5

During phototransduction, what is the immediate effect of light hyperpolarizing photoreceptor cells?

Accepted Answer

They stop releasing inhibitory neurotransmitter glutamate to bipolar cells.

Question 6

Which equation best represents the process of taste transduction for salty taste?

Accepted Answer

$$\mathrm{Na^+}$$ influx ightarrow 	ext{depolarization of gustatory epithelial cell}$

Question 7

A person with a blocked nose due to an upper respiratory tract infection reports that food tastes bland. What is the physiological explanation for this?

Accepted Answer

Taste is 80% smell, so blocking the nose reduces flavor perception.

Question 8

Which cranial nerve carries taste impulses from the anterior two-thirds of the tongue?

Accepted Answer

Facial nerve (VII)

Question 9

Which of the following is TRUE regarding the specificity of olfactory receptors?

Accepted Answer

Each receptor protein can bind several different odorants.

Question 10

Which of the following best describes the role of G protein in olfactory transduction?

Accepted Answer

G protein activation leads to cAMP synthesis, which opens Na$$^+$$ and Ca$$^{2+}$$ channels.

Question 11

Which of the following is a protective reflex triggered by the gustatory pathway?

Accepted Answer

Reflexive vomiting

Question 12

Which structure in the visual pathway is responsible for conscious perception of visual images?

Accepted Answer

Primary visual cortex in the occipital lobes

Question 13

Which of the following is a correct sequence for the visual pathway to the brain?

Accepted Answer

Optic nerve $$\rightarrow$$ optic chiasma $$\rightarrow$$ optic tract $$\rightarrow$$ thalamus $$\rightarrow$$ primary visual cortex

Question 14

Which of the following taste sensations is most sensitive and has the lowest threshold for activation?

Accepted Answer

Bitter

Question 15

Which of the following is NOT a function of the hypothalamus in the visual pathway?

Accepted Answer

Processing conscious visual images

Question 16

Which of the following is required for a chemical to be detected by taste receptors?

Accepted Answer

It must be dissolved in saliva and diffuse into taste pores.

Question 17

Which of the following is a likely cause of anosmia (loss of smell)?

Accepted Answer

Head injuries that tear olfactory nerves

Question 18

Which taste sensation is primarily triggered by the presence of glutamate and aspartate?

Accepted Answer

Umami

Question 19

Which of the following best describes the adaptation of olfactory receptors?

Accepted Answer

Olfactory adaptation occurs when Ca$$^{2+}$$ influx causes decreased response to a sustained stimulus.

Study Notes: The Special Senses (Vision, Smell, and Taste)

Study Guide - Practice Questions

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