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Chapter 15

Special Senses

QuestionAnswer
70% of sensory receptors are located in the eye
the eye is composed of what 3 layers? fibrous, vascular(uvea) & inner layer (retina)
our dominant special sense is: vision
what covers the iris & pupil? cornea
there is no blood supply in this eye structure. cornea
choroid region supplies blood to all layers of eyeball
ciliary body ring of tissue surrounding lens
ciliary muscles control: len shape
capillaries of ciliary____ secretes fluid
the suspensory ligament: holds len in position
what determines how much light enters the eye? iris
the colored part of the eye, composed of 2 layers is called the: iris
spincter pupillae pupil size decreases - parasynmpahetic
dilator pupillae pupil size increases - sympathetic
the pupil: allows light to enter eye
changes in pupil reflect our: interests & emotional reactions
bipolar cells are found in these 2 places: nose & retinas
primary visual cortex also goes by: striate cortex
what are the 3 type of neurons found in the retina? photoreceptors, bipolar neurons, and ganglion cells
_____ is the site of the blindpsot optic disc
center of vision maculae lutea
the macula lutea contains mostly: cones
what causes central vision blindness? macular degeneration
the 2 photorecptors are: rods & cones
rods night vision - need vitamin A
which one is more sensitive? rods or cones? rods
what causes night blindness? vitamin A deficiency
rhodopsin gets resynthesized by: vitamin D
cones light, sharp vision
rhodopsin helps us: see @ night
myopia nearsighted
hyperopia farsighted
in myopia, the focal point is: in front of retina
in hyperopia, the focal point is: behind retina
presbyopia "old people vision"
astigmatism unequal curvatures in different part of lens/cornea
transduction when a special stimulus converts to a chemical stimulus
__ is the site of static equilibrium macula
equilibrium responds to: head movements
macula is a __ receptor that monitors posture sensory
static equilibrium unchanging
dynamic equilibrium changing
equilibrium depends on input from: internal ear & vision
what makes up the external ear? pinna & external acoustic meatus
what part of the ear is involved with hearing? external and middle ear
the ___ transfers sound energy to the bones of the middle ear tympanic membrane
what lives in the inner ear? semicircular canals and cochlea
the cochlea houses the: organs of corti
taste is 80% __ smell
receptor organ for hearing organs of corti
sours are ___ ions hydrogen
sweets are composed of: sugars, alcohol, amino acids
salts are __ ions metal
bitter amino acids
these 2 senses are sharpest at birth. smell & taste
receptor for smell bipolar neurons
depth perception an accurate means of locating objects
ringing sounds in hear tinnitus
this disorder effects cochlear & semicircular canal. menier's syndrome
loss of an eye or destruction of optic nerve effects: depth perception & peripheral vision
conduction deafness blocked sound conduction to fluid of internal ear
olfactory neurons different from others because: they replace itself throughout life
Created by: Mariahj25