Chapter 8, Special Senses Test
What vision disorder results from the loss of lens transparency?
cataracts
The biconvex structure that focuses light on the retina is the __________.
lens
The vibration of sound waves causes the tympanic membrane, or eardrum, to move against an ossicle known as __________.
malleus or hammer
The inability to see distant objects is termed "nearsighted" or __________.
myopia
Fibers from the medial side of each eye cross over to the opposite side of the brain at the __________.
optic chiasma
What region of the retina lacks photoreceptor cells?
optic disc (blind spot)
The small, peglike projections of the tongue's surface are called __________.
papillae
What part of the retina absorbs light and prevents it from scattering inside the eye?
pigmented layer
The age-related condition resulting from decreased lens elasticity is known as __________.
presbyopia
Which one of the following is NOT a primary taste sensation? sweet, salty, pungent, bitter, or sour
pungent
Which layer of the eye contains photoreceptors known as rods and cones?
retina
What type of photoreceptor cell allows us to see gray tones in dim light, and provides our peripheral vision?
rods
The fibrous covering of the eye consists of the white outer layer, known as the __________, and a transparent portion known as the __________.
sclera; cornea
Dynamic equilibrium receptors that detect information about angular or rotational movements of the head are housed in the __________.
semicircular canals
What sensation is related to sitting motionless at a desk studying your anatomy and physiology material?
static equilibrium
The five taste sensations are __________.
sweet, sour, bitter, salty, umami
Taste - __________ containing __________ are found in the epithelium of the tongue
taste buds; chemoreceptors
What membrane divides the outer ear from the middle ear?
tympanic membrane (ear drum)
The gel-like substance housed in the posterior segment of the eye is the __________.
vitreous humor (body)
What structure is lined with ceruminous glands?
external acoustic meatus (auditory canal)
What must be stimulated in order for the sense of hearing to be transmitted to the cochlear nerve?
hair cells
- Stimulated by changes in chemical concentration of substances (Used for taste and smell)
Chemoreceptors
What is the ability of the eye to focus on close objects?
accomodation
Which of the following is a sex-linked condition that more often affects males?
color blindness
A person with total color blindness may lack __________.
cones
The transparent portion of the fibrous layer of the eye is the __________.
cornea
The auditory ossicle called the "anvil" is also known as the __________.
incus
The pupil is an opening within the __________.
iris
