Question 1

Which of the following best describes the sequence of events in phototransduction in a rod cell when exposed to light?

Accepted Answer

Light activates rhodopsin, which causes retinal to change shape, activating transducin, which then activates phosphodiesterase (PDE), leading to a decrease in cGMP, closure of Na⁺ channels, hyperpolarization of the photoreceptor, and decreased glutamate release.

Question 2

A patient presents with difficulty seeing distant objects clearly, but can see nearby objects without issue. Which condition is most likely, and what type of lens would correct it?

Accepted Answer

Myopia; corrected with a concave lens

Question 3

Which structure in the retina is responsible for the highest visual acuity and why?

Accepted Answer

Fovea centralis; it contains a high density of cones and no rods

Question 4

Which of the following best explains why glaucoma can lead to vision loss?

Accepted Answer

Increased intraocular pressure damages the optic nerve, impairing signal transmission to the brain.

Question 5

Which of the following statements about rods and cones is correct?

Accepted Answer

Rods are highly sensitive to light and are responsible for night vision, while cones are less sensitive and mediate color vision.

Question 6

A patient has difficulty hearing after an ear infection that affected the ossicles. What type of hearing loss is this, and which part of the auditory pathway is affected?

Accepted Answer

Conductive hearing loss; the middle ear (ossicles)

Question 7

Which of the following best describes the role of the semicircular canals in the vestibular system?

Accepted Answer

They detect rotational (angular) acceleration of the head.

Question 8

Which ion is primarily responsible for depolarizing hair cells in the cochlea during sound transduction?

Accepted Answer

K⁺ (potassium)

Question 9

A person with Ménière’s disease experiences episodes of vertigo. What is the underlying cause of this condition?

Accepted Answer

Excess endolymph in the vestibular system

Question 10

Which of the following best explains why the optic disc is known as the 'blind spot'?

Accepted Answer

It is the region where the optic nerve exits the eye and contains no photoreceptors.

Question 11

Which of the following taste modalities is detected by direct entry of Na⁺ ions into taste cells?

Accepted Answer

Salty

Question 12

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

Accepted Answer

It bypasses the thalamus on its way to the cortex.

Question 13

Which of the following best describes lateral inhibition in the retina?

Accepted Answer

It enhances visual sharpness by inhibiting neighboring cells, increasing contrast at edges.

Question 14

Which of the following is the correct order of structures that sound waves pass through from the external environment to the auditory nerve?

Accepted Answer

Auricle → Tympanic membrane → Ossicles → Oval window → Cochlea → Hair cells → Auditory nerve

Question 15

Which of the following best explains why cones provide high visual acuity?

Accepted Answer

Cones are densely packed in the fovea and each connects to a single bipolar cell, allowing precise spatial resolution.

Question 16

Which of the following mechanisms is responsible for the detection of sour taste?

Accepted Answer

Direct entry of H⁺ ions into taste cells

Question 17

A patient has damage to the hair cells in the cochlea. Which type of hearing loss will they most likely experience?

Accepted Answer

Sensorineural hearing loss

Question 18

Which of the following statements about the 'dark current' in photoreceptors is correct?

Accepted Answer

In darkness, Na⁺ channels are open, causing depolarization of the photoreceptor.

Question 19

Which of the following best explains why taste adapts rapidly?

Accepted Answer

Taste receptor cells quickly reduce their response to continuous stimulation.

Special Senses: Vision, Hearing, Balance, Taste, and Smell – Study Guide

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