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54 terms

Chapter 15

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What is the main function of the rods in the eye?
vision in dim light
What structure regulates the amount of light passing to the visual receptors of the eye?
Iris
Receptors for hearing are located in the ________.
cochlea
Which of the follow types of neurons are replaced throughout adult life?
olfactory receptor cells
The oil component found in tears is produced by the ________.
tarsal glands
The receptor for static equilibrium is the ________.
Macula
Farsightedness is more properly called ________.
Hyperopia
Seventy percent of all sensory receptors are located in the ________.
Eye
Which of the following structures is not part of the external ear?
pharyngotympanic tube
Nerve fibers from the medial aspect of each eye ________.
cross over to the opposite side at the chiasma
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 oval window is connected directly to which passageway?
scala vestibuli
There are three layers of neurons in the retina. The axons of which of these neuron layers
form the optic nerves?
ganglion cell
The first "way station" in the visual pathway from the eye, after there has been partial
crossover of the fibers in the optic chiasma, is the ________.
lateral geniculate body of the thalamus
As sound levels increase in the spiral organ (of Corti), ________.
outer hair cells stiffen the basilar membrane
Which of the following is true about gustatory receptors?
Complete adaptation occurs in about one to five minutes
Taste buds are not found ________.
in filiform papillae
Select the correct statement about olfaction
Olfactory receptors have a high degree of specificity toward a single type of chemical
What prevents the eyelids from sticking together when the eyes close?
tarsal gland secretions
Which of the following taste sensations is incorrectly matched to the chemicals that produce it?
umamiamino acids glutamate and lysine
U.S. employees must wear hearing protection at ________ dB or above
90
What is a modiolus?
a bone pillar in the center of the cochlea
Which statement about malnutrition-induced night blindness is most accurate?
Vitamin supplements can reverse degenerative changes
Dark adaptation ________.
involves accumulation of rhodopsin
Conscious perception of vision probably reflects activity in the ________.
occipital lobe of the cortex
In the visual pathways to the brain, the optic radiations project to the ________.
primary visual cortex
Visual inputs to the ________ serve to synchronize biorhythms with natural light and dark
suprachiasmatic nucleus
Information from balance receptors goes directly to the ________
brain stem reflex centers
Motion sickness seems to ________.
result from mismatch between visual and vestibular inputs
In the uterus ________.
despite the fact that the fetus cannot see, functional visual cortical connections are established
Most newborns ________.
often use only one eye at a time
The blind spot of the eye is where ________.
the optic nerve leaves the eye
The first vestiges of eyes in the embryo are called ________.
optic vesicles
Which pairing of terms is incorrectly related?
frequency: loudness
Olfactory cells and taste buds are normally stimulated by ________.
substances in solution
Which of the following could not be seen as one looks into the eye with an ophthalmoscope?
optic chiasma
The cells of the retina in which action potentials are generated are the ________.
ganglion cells
During dark adaptation ________.
rhodopsin accumulates in the rods
Tinnitis, vertigo, and gradual hearing loss typify the disorder called ________.
Ménière's syndrome
Which of the following is not a characteristic of olfactory receptor cells?
They are unipolar neurons.
An essential part of the maculae involved in static equilibrium is (are) the ________.
otoliths
Which of the following is true about light and vision?
When we see the color of an object, all light is being absorbed by that object except for the
color being experienced.
The tarsal plate of the eyelid ________.
is connected to the levator palpebrae
Which of the following is true about photoreceptors?
Rods absorb light throughout the visual spectrum but confer only gray tone vision
Select the correct statement about equilibrium
Cristae respond to angular acceleration and deceleration.
The eye muscle that elevates and turns the eye laterally is the ________.
inferior oblique
The receptor membranes of gustatory cells are ________.
gustatory hairs
Light passes through the following structures in which order?
cornea, aqueous humor, lens, vitreous humor
Damage to the medial recti muscles would probably affect ________.
convergence
Which statement about sound localization is not true?
It requires processing at the cortical level.
Which of the following is not a possible cause of conduction deafness?
cochlear nerve degeneration
Visual processing in the thalamus does not contribute significantly to ________.
night vision
Visible light fits between ________
UV and infrared
Ceruminous glands are ________.
modified apocrine sweat glands