ch 17

Created by lahski 

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33 terms

Before an olfactory receptor can detect an odorant, it has to
bind to receptors in olfactory cilia.
respond to applied pressure.
be transported to the olfactory bulbs.
gate open ion channels.
contact a specialized olfactory cell.

a

Olfactory information is first received by which part of the brain?
ANSWER:
frontal lobe
cerebellum
cerebrum
parietal lobe
medulla oblongata

c

Taste buds are monitored by cranial nerves
ANSWER:
VII, IX, X.
IX, XI, XII.
VII, VIII, IX.
V, VII, IX.
IX, X, XI.

a

Taste buds are monitored by which cranial nerve(s)?
ANSWER:
facial nerve (VII)
vagus nerve (X)
trigeminal nerve (V)
facial nerve (VII), vagus nerve (X), and glossopharyngeal nerve (IX)
glossopharyngeal nerve (IX

d

The sense of taste is also known as ________.

gustation

A typical gustatory cell survives for only about ________ days before it is replaced.

10

What structure changes the shape of the lens for far and near vision?
aqueous humor
extrinsic eye muscles
iris
ciliary body
None, because the lens is rigid.

d

The space between the iris and ciliary body and the lens is the
posterior chamber.
canal of Schlemm.
anterior chamber.
vitreous body.
pupil.

a

The neural tunic of the eye
contains ganglion cells.
is the deepest layer of the eyeball.
contains the photoreceptor cells.
contains bipolar cells.
All of the answers are correct.

e

The human lens focuses light on the photoreceptor cells by
changing shape.
opening and closing.
moving up and down.
dilating and constricting.
moving in and out.

a

The shape of the lens is controlled by the
cornea.
pupillary sphincter muscles.
iris.
pupillary radial muscles.
ciliary muscles.

e

The part of the eye that determines eye color is the
canal of Schlemm.
cornea.
iris.
pupil.
conjunctiv

c

The opening in the iris through which light passes is the
anterior chamber.
conjunctiva.
pupil.
posterior chamber.
cornea.

c

Which of the following description applies to the term myopia?
normal vision
farsightedness
age-related decline in accommodation
nearsightedness
astigmatism

d

Which of the following is a function of tears?
nourish the cornea and conjunctiva
wash away debris
lubricate the eye
provide oxygen
All of the answers are correct.

e

The cornea is part of the
choroid.
iris.
neural tunic.
fibrous tunic.
uvea.

d

If your vision is 20/15, this means that you can
see 20-point type at 15 feet.
see objects at 20 feet that individuals with normal eyesight can see at 15 feet.
see objects that are 20 feet or less away.
see objects at 15 feet that individuals with eye problems see at 20 feet.
see all 15 eye chart letters from 20 feet.

b

The optic disc is a blind spot because
humans are unable to focus light on that area of the retina.
the retina lacks nerves in the optic disc.
the vitreous body is too thick in this area for the passage of light.
there are no photoreceptors in that area.
the fovea prevents light from striking the optic disc.

d

What structure regulates the amount of light that passes to the photoreceptors of the eye?
vitreous body
cornea
lens
ciliary muscle
iris

e

An irregularity in curvature in the cornea or lens called a(n) ________ causes a reduction in visual acuity.

astigmatism

A person suffering from ________ can see objects that are close, but distant objects appear blurred.

myopia

A person suffering from ________ can see distant objects more clearly than those that are close

hyperopia

When a rod is stimulated by light,
less neurotransmitter is released.
the retinal changes from the 11-cis to the 11-trans form.
cGMP decreases and sodium channels close.
the plasma membrane becomes hyperpolarized.
All of the answers are correct.

e

The first step in the process of photoreception is
absorption of a photon by a visual pigment.
the bleaching of rods.
inhibition of the sodium pumps.
release of neurotransmitter.
the bleaching of cones.

a

A pigment synthesized from vitamin A is
cGMP.
transducin.
opsin.
retinal.
rhodopsin.

d

A loud noise causes
reflex contractions of middle ear muscles.
a large movement of the tympanic membrane.
an alerting reaction leading to sympathetic activation.
a big pressure pulse entering the cochlear duct at that oval window.
All of the answers are correc

e

The vibrations received by the tympanic membrane are transferred to the oval window by the
stapedius muscle.
tensor tympani.
cochlea.
oval window.
auditory ossicles

e

The middle ear communicates with the nasopharynx through the
auditory meatus.
auditory tube.
membranous labyrinth.
bony labyrinth.
auricle.

b

The senses of equilibrium and hearing are provided by receptors in the
membranous endolymph.
bony labyrinth.
perilymph.
inner ear.
organ of Schlemm

d

the region of the ampulla that contains the receptors for rotational (dynamic) equilibrium are called
fovea.
maculae.
ampullae.
utricles.
cristae.

e

The sensory receptors of the semicircular canals are located in the
perilymph.
ampullae.
saccules.
utricles.
cupulae

b

The hair cells of the utricle and saccule are clustered in
cupulae.
cristae.
ampullae.
otoconia.
maculae.

e

The secretion commonly called earwax is produced by ________ glands.

ceruminous

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