Question 1

Which of the following statements best explains why dogs have a much better sense of smell than humans?

Accepted Answer

Dogs have 72 times more olfactory receptor surface area than humans, allowing them to distinguish more chemical stimuli.

Question 2

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

Accepted Answer

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

Question 3

A patient presents with difficulty distinguishing between sweet and salty tastes but can still detect sour and bitter. Which lingual papillae are most likely affected?

Accepted Answer

Fungiform papillae

Question 4

Which structure of the eye is responsible for controlling the amount of light entering the eye?

Accepted Answer

Iris

Question 5

If the ciliary muscle contracts, what happens to the shape of the lens and the focal point of incoming light?

Accepted Answer

The lens becomes rounder, focusing light on nearby objects.

Question 6

Which equation correctly represents the relationship between frequency ($$f$$), wavelength ($$\lambda$$), and the speed of sound ($$v) in $$air?

Accepted Answer

$$v = f 	imes \lambda$$

Question 7

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

Accepted Answer

The image is focused in front of the retina and is corrected with a diverging lens.

Question 8

Which of the following best explains the process of photoreception in rods when exposed to light?

Accepted Answer

Retinal changes from 11-cis to 11-trans form, activating opsin and leading to closure of sodium channels.

Question 9

Which structure in the ear is responsible for detecting rotational movements of the head?

Accepted Answer

Semicircular canals

Question 10

A patient experiences nystagmus while stationary. Which anatomical structure is most likely damaged?

Accepted Answer

Brainstem or internal ear

Question 11

Which of the following correctly describes the path of olfactory information to the brain?

Accepted Answer

Olfactory sensory neurons → olfactory bulb → olfactory tract → olfactory cortex

Question 12

Which of the following is true regarding the blind spot in the retina?

Accepted Answer

It is the origin of the optic nerve and contains no photoreceptors.

Question 13

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

Accepted Answer

They provide information about gravity and linear acceleration by distorting hair cells in the maculae.

Question 14

Which of the following is a direct consequence of decreased cyclic GMP levels in photoreceptors?

Accepted Answer

Chemically gated sodium ion channels close, reducing the dark current.

Question 15

Which of the following structures is responsible for producing aqueous humor in the eye?

Accepted Answer

Ciliary body

Question 16

A patient has difficulty hearing high-frequency sounds. Which part of the cochlea is most likely damaged?

Accepted Answer

The region near the oval window (base)

Question 17

Which of the following best describes the process of accommodation in the eye?

Accepted Answer

The lens changes shape to focus light on the fovea centralis.

Question 18

Which of the following is a function of the tarsal glands in the eyelids?

Accepted Answer

Secrete lipid-rich product to prevent eyelids from sticking together.

Question 19

Which of the following best explains why the image formed on the retina is both upside down and reversed left to right?

Accepted Answer

Light rays are refracted by the cornea and lens, causing inversion and reversal of the image.

Question 20

Which of the following equations correctly represents the calculation of decibel intensity ($$I_{dB}) $$given a sound intensity ($$I) $$and a reference intensity ($$I_0$$)?

Accepted Answer

$$I_{dB} = 10 	imes \log_{10} \left( \frac{I}{I_0$} ight)$$

Special Senses: Structure and Function in Anatomy & Physiology

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