Chapter 15

U.S. employees must wear hearing protection at _______ dB or above.

90

Farsightedness is more properly called ________.

Hyperopia

Ceruminous glands are ________.

Modified apocrine sweat glands

Visual inputs to the _______ severe to synchronize biorhythms with natural light and dark.

Suprachiasmatic nucleus

Presbyopia is not ________.

The unequal curvature of refracting surfaces

_________ is a disorder of the olfactory nerves.

Anosmias

Helps maintain the intraocular pressure; located in the anterior part of the eye.

Aqueous humor

The vascular coat of the eyeball; deeply pigmented.

Choroid

The muscle responsible for altering the shape of the lens.

Ciliary muscle

Receptors for hearing are located in the ________.

Cochlea

Which of the following is not a possible cause of conduction deafness?

Cochlear nerve degeneration

Which of the following is true about gustatory receptors?

Complete adaptation occurs in about one to five minutes.

A condition of deafness that may result from otosclerosis.

Conduction deafness

Light passes through the following structures in which order?

Cornea, aqueous humor, lense, vitreous humor

Nerve fibers from the medial aspect of each eye ________.

Cross over to the opposite side of the chiasma

Area of greatest visual acuity.

Fovea centralis

A condition often leading to blindness due to increased intraocular pressure.

Glaucoma

The receptor membranes of gustatory calls are ________.

Gustatory hairs

Ordinarily, it is not possible to transplant tissues from one person to another, yet corneas can be transplanted without tissue rejection. This is because the cornea ________.

Has no blood supply

The eye muscle that elevates and turns the eye laterally is the _________.

Inferior oblique

What structure regulates the amount of dim light passing to the visual receptors of the eye?

Iris

The structure most responsible for focusing light rays that enter the eye.

Lens

The receptors for static equilibrium is the ________.

Macula

Tinnitis, vertigo, and gradual hearing loss typify the disorder called _______.

Meniere's syndrome

A condition that can result from a deficiency of vitamin A

Night blindness

Most newborns _________.

Often use only one eye at a time.

Which of the following could not be seen as one looks into the eye with an opthalmascope?

Optic chiasma

An inflammation of the lining of the middle ear.

Otitis media

Which of the following structures is not part of the external ear?

Pharyngotympanic tube

A muscle that moves the eyeball.

Rectus muscle

Motion sickness seems to _______.

Result from mismatch between visual and vestibular inputs.

The sensory layer of the eye.

Retina

Which of the following is true about photoreceptors?

Rods absorb light throughout the visual spectrum but confer only gray tone vision.

The white, outer tough connective tissue covering of the eyeball.

Sclera

Select the correct statement about olfaction.

Some of the sensation of olfaction is actually one of pain.

The oil component found in tears is produced by the ________.

Tarsal glands

Visible light fits between ________.

UV and infrared

What is the main function of the rods in the eye?

Vision in dim light

Which statement about malnutrition-induced night blindness is most accurate?

Vitamin supplements will reverse degenerative changes.

The blind spot of the eye is _______.

Where the optic nerve leaves the eye