Question 1

Which structure is responsible for producing tears that contain mucus, antibodies, and antibacterial lysozyme, and what is the pathway for tear drainage into the nasal cavity?

Accepted Answer

The lacrimal gland; tears drain through the lacrimal canaliculi, lacrimal sac, and nasolacrimal duct into the nasal cavity.

Question 2

A patient presents with a painless, firm bump on their eyelid. Which structure is most likely obstructed, and what is this condition called?

Accepted Answer

Tarsal (Meibomian) gland; Chalazion

Question 3

Which muscle is responsible for moving the eye laterally, and which cranial nerve innervates it?

Accepted Answer

Lateral rectus; Cranial nerve VI (abducens)

Question 4

Which part of the eye is responsible for most of the eye’s refractory power, and why can’t it change focus?

Accepted Answer

Cornea; its curvature is constant and cannot be altered

Question 5

During accommodation for near vision, which of the following changes occur in the eye?

Accepted Answer

Ciliary muscle contracts, ciliary zonule loosens, and the lens becomes more convex

Question 6

A patient is diagnosed with myopia. Which of the following best describes the optical defect and its correction?

Accepted Answer

The eyeball is too long, causing the focal point to be in front of the retina; corrected with a concave lens.

Question 7

Which of the following best explains why rods are more sensitive to light than cones?

Accepted Answer

Rods have a higher degree of convergence, allowing many rods to synapse onto a single ganglion cell.

Question 8

Which of the following steps occurs first in the phototransduction cascade in rods when exposed to light?

Accepted Answer

Rhodopsin absorbs light, causing 11-cis-retinal to convert to all-trans-retinal.

Question 9

Which of the following best describes the function of the pigmented layer of the retina?

Accepted Answer

Absorbs light to prevent scattering, phagocytizes photoreceptor fragments, and stores vitamin A.

Question 10

A patient reports seeing 'halos' around lights and has increased intraocular pressure. Which condition is most likely, and what is the underlying cause?

Accepted Answer

Glaucoma; impaired drainage of aqueous humor increases intraocular pressure.

Question 11

Which of the following best describes the neural pathway for conscious visual perception?

Accepted Answer

Retinal ganglion cell axons → optic nerve → optic chiasma → optic tract → lateral geniculate nucleus of thalamus → optic radiation → primary visual cortex

Question 12

Which of the following is true regarding the adaptation of the eye to bright light (light adaptation)?

Accepted Answer

Rods are turned off, retinal sensitivity decreases, and cones rapidly adapt.

Question 13

Which of the following statements about the chemical senses is correct?

Accepted Answer

Both taste and smell use chemoreceptors that require chemicals to be dissolved in aqueous solution.

Question 14

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

Accepted Answer

Odorant binds to receptor → G protein (Golf) activation → adenylate cyclase activation → cAMP production → opening of cation channels → depolarization

Question 15

Which cranial nerves are primarily responsible for transmitting taste information from the tongue to the brain?

Accepted Answer

Facial (VII), Glossopharyngeal (IX), and Vagus (X)

Question 16

Which of the following best explains why foods taste bland when you have a blocked nose?

Accepted Answer

Taste is 80% smell, so olfactory input is necessary for full taste perception.

Question 17

Which structure in the ear is responsible for equalizing pressure between the middle ear and the external environment?

Accepted Answer

Pharyngotympanic (auditory) tube

Question 18

Which part of the inner ear contains the receptors for hearing, and what is the name of the receptor organ?

Accepted Answer

Cochlea; spiral organ (organ of Corti)

Question 19

Which of the following best describes the function of the maculae in the vestibular system?

Accepted Answer

Monitor static equilibrium and linear acceleration

Special Senses: The Eye and Vision

Study Guide - Practice Questions

Study Guide - Flashcards