Question 1

Loss of lens transparency is referred to as

Accepted Answer

Loss of lens transparency is a defining characteristic of cataracts. Loss of lens transparency is known as cataract.

Question 2

Visual pigments are derivatives of

Accepted Answer

The answer of Visual pigments are derivatives of
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Question 3

As a result of the tympanic reflex,

Accepted Answer

The tympanic reflex reduces the efficiency of vibrations by tightening the muscles in the middle ear, which dampens the movement of the auditory ossicles to protect the inner ear from loud sounds.

Question 4

Stereoscopic vision results when the

Accepted Answer

Stereoscopic vision is the result of images in each eye being slightly different, which allows the brain to perceive depth and three-dimensional space. This is because the brain can compare the slightly different images received by each eye to determine the relative position and distance of objects in the visual scene.

Question 5

As nerve fibers from the retina travel to the brain, axons from the

Accepted Answer

The axons from the nasal half of each eye cross over at the optic chiasm, while the axons from the temporal half of each eye do not cross over. This allows for information from both eyes to be processed in both hemispheres of the brain, leading to binocular vision.

Question 6

Nearsightedness is more properly called

Accepted Answer

Nearsightedness is more properly called myopia.

Question 7

A device that monitors the activity of the photoreceptor cells of the eye indicates that there is a constant flow of neurotransmitter being released by the photoreceptor cells. This information implies that the subject is

Accepted Answer

When in a dark room, the photoreceptor cells are not receiving any light stimulus, causing a constant release of neurotransmitter. This is known as the dark current.

Question 8

The daily day/night cycle known as a circadian rhythm is established in the

Accepted Answer

The answer of The daily day/night cycle known as a...

Question 9

Visual acuity is also known as

Accepted Answer

Visual acuity is a term used to describe how clear someone's vision is. It is a measure of how well a person can see fine details and is often tested by reading letters on an eye chart. It is not synonymous with nearsightedness, farsightedness, myopia, or astigmatism, which are all specific refractive errors that affect visual acuity.

Question 10

When all three cone populations are stimulated, one sees

Accepted Answer

When all three cone populations are stimulated equally, the brain perceives it as white. This is because the three types of cones in our eyes are responsible for detecting different wavelengths of light that correspond to different colors - red, green, and blue. When all three cones are equally stimulated, the brain interprets it as a combination of all three colors, resulting in white light.

Question 11

The lens of the eye thickens when the

Accepted Answer

The answer of The lens of the eye thickens when...

Question 12

The color receptors within the retina are sensitive to lights that are

Accepted Answer

The three types of color receptors (cones) within the retina are sensitive to light waves that correspond to the colors red, blue, and green. This is known as the trichromatic theory of color vision. Therefore, choice A is the correct answer.

Question 13

Rhodopsin is found in

Accepted Answer

Rhodopsin is a visual pigment found in rods, which are responsible for vision in low light conditions.

Question 14

Night blindness can be treated by administering

Accepted Answer

Night blindness is often caused by a deficiency in vitamin A, which is necessary for the proper functioning of the retina. Administering vitamin A supplements can help alleviate the symptoms of night blindness. Night blindness is often caused by a deficiency in vitamin A, which is important for the function of the retina. Therefore, administering vitamin A can help to alleviate night blindness. Vitamin D, E, K, and C are not directly related to night blindness.

Question 15

A blind spot in the retina occurs where

Accepted Answer

The blind spot in the retina occurs where the optic nerve attaches to the retina. This is because there are no photoreceptor cells (rods or cones) in this area, where the axons of the ganglion cells converge to form the optic nerve.

Question 16

Treatment of a cataract usually involves removal of the

Accepted Answer

A cataract is a clouding of the lens in the eye, which affects vision. Treatment for cataracts usually involves the surgical removal of the lens. Cataract involves clouding of the lens, which hinders vision. The only effective treatment for cataract is surgical removal of the cloudy lens.

Question 17

Normal eye focusing is termed

Accepted Answer

Emmetropia refers to the normal eye's ability to focus correctly on objects both near and far, without the need for corrective lenses. A is incorrect because hyperopia is farsightedness, where distant objects can be seen clearly but close objects appear blurry. B is incorrect because myopia is nearsightedness, where close objects can be seen clearly but distant objects appear blurry. C is incorrect because presbyopia is the natural loss of ability to focus on close objects, typically due to aging. E is incorrect because refraction refers to the bending of light as it passes through materials of different densities, such as the cornea and lens of the eye. Emmetropia refers to normal or ideal eye focusing, where the light rays coming into the eye are precisely focused on the retina without any refractive error, providing clear vision at all distances.

Question 18

The hearing receptors are located in the

Accepted Answer

The organ of Corti, which is located in the cochlea of the inner ear, is where the hearing receptors, i.e. hair cells responsible for transducing sound waves into neural signals, are located. The other structures listed (ampulla, utricle, saccule, and semicircular canals) are parts of the vestibular system, which is responsible for sensing balance and spatial orientation, not hearing.

Question 19

There are three different types of cones, each one sensitive to a different color wavelength of light. These cones are designated

Accepted Answer

The three types of cones are sensitive to different wavelengths of light corresponding to the colors red, blue, and green. Therefore, the best choice is B, which lists these three colors. The three types of cones are sensitive to the wavelengths of light that correspond to red, blue, and green, respectively. Therefore, the correct combination is red, blue, and green, which is choice B.

Question 20

The anterior cavity is

Accepted Answer

The anterior cavity is filled with aqueous humor, which is a clear fluid that helps to maintain the shape of the eye and provides nutrients to the surrounding tissues. The anterior cavity of the eye is a space between the cornea and the lens that is filled with aqueous humor. The vitreous body fills the posterior cavity of the eye, and perilymph and endolymph are inner ear fluids, not found in the eye.

Quiz 9: The General and Special Senses