ch 17 hw a&p1
The abnormality that develops when a lens loses its transparency is known as ______
A cataract
The ciliary muscle contracts to ________
Adjust the shape of the lens for near vision
The first step in the process of olfaction is ______
An odorant molecule binding to a specific protein
The space between the cornea and the iris is the ______
Anterior chamber
In glaucoma, increasing pressure due to fluid build-up in he chambers of the eye can lead to nerve damage and ultimately lead to blindness. What is the name of the fluid in the anterior chamber?
Aqueous humor
Which of these is NOT a division of the bony labyrinth?
Auditory ossicles
Before an olfactory receptor can detect an odorant, it has to ________
Bind to receptors in olfactory cilia
Relative movement of the ________ in the semicircular ducts signals rotation of the head.
Endolymph
The function of the auditory tube is to _______
Equalize air pressure on both sides on the tympanic membrane
The "white" of the eye is part of the ______ layer.
Fibrous
The region of the retina that contains only tightly packed cones is the ______
Fovea centralis
The membrane structures that respond to chemical stimuli to produce sweet, bitter, and umami sensations are called ______
G proteins
The cell of the retina that produces an action potential that goes to the brain is a ______
Ganglion cell
The cochlear receptors that provide our sense of hearing are ______
Hair cells
Amacrine and _____ cells facilitate or inhibit communication between photoreceptors and ganglion cells
Horizontal
Lacrimal glands produce a ______ fluid
Hypotonic
Under which condition for the release of neurotransmitters photo receptors be greatest?
In a pitch black room after 30 minutes
What are the three parts of the vascular layer of the eye?
Iris, choroid, and ciliary body
Olfactory glands secrete a thick, pigmented _____ that absorbs water.
Mucus
which of the following description applies to the term myopia?
Nearsightedness
The olfactory organ consists of the _______ and ________
Olfactory epithelium and Lanita propria
Which cranial nerve carries visual information from the eyeball to the brain?
Optic nerve
What would result from an invasion of micro organisms under the Eustachian tube?
Otitis media
The ________ ear collects sound waves and transmits them to the ______ ear, which contains auditory ossicles.
Outer;middle
Which of these is the correct pathway for transmission of visual information?
Photoreceptor-> bipolar cell-> ganglion cell
The space between the iris and ciliary body and the lens is the _______
Posterior chamber
What are the three color photoreceptors?
Red, blue and green cone
All visual pigments contain _______ derived from ________.
Retinal; vitamin A
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.
Name the largest portion of the fibrous layer
Sclera
What are the parts of the fibrous layer?
Sclera and cornea
Which of these is not one of the eye?
Scleral layer
Olfactory glands _________________
Secrete a pigmented mucus.
Gustatory receptors are found in _______
Some lingual papillae
The external acoustic meatus ends at the _________
Tympanic membrane
The chain of ossicles begins at the _______ and ends at the _______
Tympanic membrane; oval window
Which of the following is involved in the gustatory perception of an amino acid?
Umami receptors
The ________ convey information about head position with respect to gravity.
Utricle and saccule
What are parts of the bony labyrinth?
Vestibule, cochlea, and semicircular canals
An elongated outer segment containing membranous discs that is connected by a thin stalk to the inner segment best describes _______
A photoreceptor
The human lens focuses light on the photoreceptor cells by ________
Changing shape
What structure changes the shape of the lens for far and near vision?
Ciliary body
Which of the following lingual papillae has the largest number of taste buds?
Circumvallate papillae
During motion sickness, the brain receives conflicting signals regarding ones placement in space. Which of the following structures is least likely to be involved in motion sickness?
Cochlear duct
Which of the following is NOT a structure within the visual axis?
Conjunctiva
A ray of light entering the eye will encounter the following structures in which order?
Conjunctiva-> cornea-> aqueous humor-> lens-> vitreous body-> retina
What is the difference between rods and cones with respect to color vision?
Cons contain retinal attached to different forms of Opsin
During accommodation, the culinary muscle ______ and the suspending ligaments become ________ which in turn, cause the lens to become _______
Contracts;loose;round
In the human eye, most refraction occurs when light passes through the _________
Cornea
What is the structure that allows light to first enter the eye?
Cornea
what structure would not be found in the vascular layer of the eye?
Cornea