Question 1

Which structure of the eye is responsible for most of the eye's refractory power, and why is its ability to change focus limited?

Accepted Answer

The cornea; because its curvature is constant and cannot be altered.

Question 2

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

Accepted Answer

Myopia; corrected with a concave lens.

Question 3

Which of the following best describes the process of phototransduction in rods?

Accepted Answer

Light hyperpolarizes rods, decreasing glutamate release and allowing bipolar cells to depolarize.

Question 4

Which of the following equations correctly represents the relationship between frequency ($$f$$), wavelength ($$\lambda$$), and the speed of light ($$c) in $$the context of visible light?

Accepted Answer

$$c = f 	imes \lambda$$

Question 5

A person is exposed to a loud sound of 120 dB for an extended period. Which structure in the ear is most at risk for damage, and why?

Accepted Answer

The cochlear hair cells, because they are sensitive to excessive vibration and cannot regenerate.

Question 6

Which cranial nerve carries taste information from the anterior two-thirds of the tongue to the brain?

Accepted Answer

Facial nerve (VII)

Question 7

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

Accepted Answer

Taste is 80% smell, and olfactory input is reduced when the nose is blocked.

Question 8

Which of the following is a function of the pigmented layer of the retina?

Accepted Answer

Absorbing light to prevent scattering and storing vitamin A.

Question 9

A patient has lost vision in the right half of their visual field in both eyes. Where is the most likely location of the neural lesion?

Accepted Answer

Left visual cortex (occipital lobe).

Question 10

Which of the following best describes the role of the crista ampullaris in the inner ear?

Accepted Answer

Detects angular (rotational) movements of the head.

Question 11

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

Accepted Answer

Cones require bright light and provide high-resolution, color vision.

Question 12

Which of the following best explains the physiological basis for olfactory adaptation?

Accepted Answer

Continuous exposure to an odorant causes Ca2+ influx, which decreases the response to a sustained stimulus.

Question 13

Which of the following is the correct sequence for the pathway of sound transmission from the external environment to the cochlea?

Accepted Answer

Auricle → tympanic membrane → auditory ossicles → oval window → cochlea

Question 14

Which of the following best describes the function of aqueous humor in the anterior segment of the eye?

Accepted Answer

Supplies nutrients and oxygen to the lens and cornea, and removes wastes.

Question 15

Which of the following is true regarding the neural processing of visual information?

Accepted Answer

Each optic tract carries information from the same half of the visual field from both eyes.

Question 16

Which of the following best explains why the lens becomes less elastic with age, leading to presbyopia?

Accepted Answer

Lens fibers are continually added, making the lens denser, more convex, and less elastic.

Question 17

Which of the following best describes the function of the maculae in the vestibule of the inner ear?

Accepted Answer

Monitor static equilibrium and linear acceleration.

Question 18

Which of the following is the correct order of neural signal transmission in the retina?

Accepted Answer

Photoreceptors → bipolar cells → ganglion cells

Question 19

Which of the following best explains why a person with red-green color blindness has difficulty distinguishing between red and green objects?

Accepted Answer

They lack either red or green cone pigments, so those wavelengths are not properly detected.

Special Senses: Vision, Smell, Taste, Hearing, and Balance – ANP College Study Notes

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