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Chapter 15
Special Senses
| Question | Answer |
|---|---|
| 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
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