BIO 125 Chapter 12 Homework

Which of the following correctly describes the distribution of rods and cones in the retina?

Cones are more highly concentrated in the fovea centralis.

Pain receptors adapt slowly or not at all because __________.

Lack of adaptation is important to survival.

chronic disorder of the inner ear; symptoms include nausea, dizziness, and loss of hearing

Meniere's Syndrome

With regard to dynamic equilibrium and static equilibrium, we can say that ________.

Receptors in the semicircular canals are responsible for dynamic equilibrium, and receptors in the vestibule are responsible for static equilibrium.

What do the receptors in the skin for light touch and the receptors in the nose for smell have in common?

They both adapt very quickly

Whether a sound is interpreted by the brain as a higher or lower pitch is determined by the ________.

anatomy of the basiliar membrane

1. condition resulting from irregularities in the shape of the lens or cornea; symptoms include blurred vision

astigmatism

In what order do the structures of the ear come into play when hearing?

auditory canal, tympanic membrane, malleus, cochlea, cochlear nerve

Foods that are potentially poisonous or inedible can often be detected by the ________ taste receptors, which are located at the very back of the tongue.

bitter

Part complete Which of the following is/are involved in focusing light?

both lens and cornea

Which of the following can be corrected with corrective lenses?

both myopia and hyperopia

condition that results from a decrease in the normal transparency of the lens

cataracts

Which part of the ear generates impulses for sound?

cochlea

Which of the following is known to be an inherited, X-linked disorder?

color blindness

Which of the following correctly traces the path of light through the eye?

cornea, aqueous humor, pupil, lens, vitreous humor, retina

Which of the following sequences represents the pathway by which sound waves travel through the ear?

external auditory canal, eardrum, oval window, cochlea

The _____ is the region of the eye where photoreceptors are most highly concentrated.

fovea

condition caused by blockage of the canal of Schlemn; increased amount of aqueous humor caused increased pressure in the eye; may lead to blindness

glaucoma

The _____ changes shape to focus light on the retina.

lens

Amplifying the sound waves is the primary function of which part of the ear?

middle ear

distant objects appear out of focus because the eyeball is longer than normal; also known as nearsightednes

myopia

The structure of the inner ear that converts pressure waves to impulses is the __________.

organ of Corti

inflammation of the middle ear; a common cause of earaches

otitis media

These are like little rocks in the inner ear that shift in response to gravity or linear acceleration

otoliths

condition that generally occurs after age 40 as the lens stiffens; results in the inability to focus on objects that are nearby

prebyopia

What name is given to the opening that allows light into the interior of the eye?

pupil

When an individual first gets dressed, he or she is conscious of the clothing on his body. A short time later, however, he or she is no longer aware of it. This phenomenon of the CNS ignoring a relatively unimportant sensation is known as ________.

receptor adaptation

A more powerful stimulus will __________.

result in both activation of more receptors and more frequent action potentials

The photoreceptors of the eye are __________.

rods and cones

What name is given to the tough layer that forms the "white" of the eye?

sclera

Which one of the following structures is used to sense rotational movement of the head and body?

semicircular canals

Receptor adaptation results when __________.

sensory neurons stop sending action potentials

Stereocilia are embedded in a gelatinous structure known as the ________.

tectorial membrane

Which of the following will regulate the amount of light entering the eye?

the iris

When we adjust our head and eye position to carefully look at something, we are directing the image to focus on __________.

the macula

Rhodopsin is __________.

the photopigment found in rods

Receptors are classified according to __________.

the type of stimulus energy they convert

Olfactory receptors are located in which one of the following?

upper part of nasal passages

Texting while driving involves which three sensory distractions?

visual, cognitive, and manual

The optic disc is the area of the eye __________.

where the optic nerve exits the eye