52 terms

A&P II ch 17 special senses

before an olfactory receptor can detect an odorant, it has to
bind to receptors in olfactory cilia
how would a molecule that mimics cAMP affect an olfactory receptor
-it would increase sodium permeability
-it would open chemically-gated sodium channels
-it would depolarize the olfactory receptor
-it could trigger an afferent action potential
gustatory receptors are located
on the surface of the tongue
which of the following lingual papillae has the largest number of taste buds
circumvallate papillae
a patient who experienced head trauma has lost the ability to taste spicy food. you should expect damage to cranial nerve ____
which of the following is not one of the six primary taste sensations
the taste sensation that is triggered by the amino acid glutamate is known as
all of the following are true of the fibrous tunic of the eye, except that it
produces aqueous humor
what structure changes the shape of the lens for far and near vision
ciliary body
the space between the iris and ciliary body and the lens is the
posterior chamber
the neural tunic of the eye
-contains ganglion cells
-contains the photoreceptor cells
-contains bipolar cells
-is the deepest layer of the eyeball
the human lens focuses light on the photoreceptor cells by
changing shape
the vitreous body
helps to stabilize the eye and give physical support to the retina
the space between the cornea and iris is the
anterior chamber
the shape of the lens is controlled by the
ciliary muscles
the transparent portion of the fibrous tunic is the
the part of the eye that determines eye color is the
the opening in the iris through which light passes is the
in the human eye, most refraction occurs when light passes through the
the ciliary muscles contract to
adjust the shape of the lens for near vision
which of the following descriptions best matches the term aqueous humor
excessive production may lead to glaucoma
if your vision is 20/15, this means that you can
see objects at 20 feet that individuals with normal eye sight can see at 15 feet
what structure regulates the amount of light that passes to the photoreceptors of the eye
ciliary muscle
the optic disc is a blind spot because
there are no photoreceptors in that area
there are three different types of cones, each one sensitive to different light energies. these cones are designated
red, green, blue
when all three cone populations are stimulated equally, we perceive
the first step in the process of photoreception is
absorption of a photon by a visual pigment
visual pigments are derivatives of the compound
a pigment synthesized from vitamin A is
which of the following is true about rhodopsin
-called visual purple
-is bleached during photoreception
-is the visual pigment in rods
-consist of opsin + retinal
having to adjust to a dark room after walking in from bright light is because
rods exposed to strong light need time to regenerate rhodopsin
the ____ ear collects sound waves and transmits them to the ____ ear, which contains auditory ossicles
outer; middle
the external acoustic meatus ends at
the tympanic membrane
the auditory ossicles connect the
tympanic membrane to the oval window
the vibrations received by the tympanic membrane are transferred to the oval window by the
auditory ossicles
the middle ear communicates with the nasopharynx through the
auditory tube
the sense of equilibrium and hearing are provided by receptors in the
inner ear
the structure that supports the organ of corti is the
basilar membrane
gravity and linear acceleration are sensed in the
saccule and utricle
when an external force bends the stereocilia of the inner ear hair cells,
there is a change in the transmembrane potential of the hair cells
the region of the ampulla that contains the receptors for rotational (dynamic) equilibrium are called
the superficial hard part of the inner ear is called the ____ and contains ____
bony labyrinth; perilymph
movement of the endolymph in the semicircular canals
signals rotational movements
the energy from a pressure wave in the cochlear fluids is released by the bulging and stretching of the
the function of the auditory tube is to
equalize air pressure on both sides of the tympanic membrane
standing still in an elevator that suddenly lowers will stimulate receptors in the
utricle and saccule
an infection that damages the vestibular nerve could result in a loss of
the hair cells of the utricle and saccule are clustered in
the frequency of a perceived sound depends on
which part of the cochlear duct is stimulated
perception of gravity and linear acceleration depends on
the force exerted by otoliths on hair cells of the maculae
sound waves are converted into mechanical movements by the
tympanic membrane
which of the following descriptions best matches the term stereocilia
bending these produces receptor potential in hair cells