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Define sensation?
awareness of the environment
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Define adaptation?
receptors respond less to prolonged stimulation
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Define pain?
unpleasant sensation d/t real or potential damage
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Define proprioception?
subconscious awareness of body position
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Define olfacation?
smell, mediated by chemoreceptor
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Define gustation?
- taste, mediated by chemoreceptor
- adaptation: yes
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Define audition?
- outer ear- pinna > external auditory, canal= funnels sound
- middle ear- tympanic membrane > ossicles= amplifies sound
- inner ear-
- A. cochlea= hearing (mechanoceptor)
- B. vestibule and semicircular canals= equilibrium (proprioceptors)
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Which senses are not subject to adaptation?
- a. proprioception (unconscious awareness of body position)
- b. vision
- c. pain
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What are the general senses, and what receptor types do they serve?
- a. touch- thermoceptor
- b. pain- nociceptor
- c. proprioception- proprioceptor
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What are the special senses? Whisch receptor type serves each one?
- a. olfacation- chemoreceptor
- b. gustation- chemoreceptor
- c. vision
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What is the purpose of pain?
protection
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What is the location and function of the cornea?
anterior transparent....refracts light
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What is the location and function of the aqueous humor?
anterior cavity....nourishes cornea and lens
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What is the location and function of the iris?
anterior lens....regulates light passage thru pupil
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What is the location and function of the lens?
posterior to iris and pupil....refracts (bends) light to focus image on retina
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What is the location and function of the vitreous humor?
posterior activity....maintains eye shape
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What is the location and function of the choroid?
between sclera and retina....vessels nourish retina
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What is the location and function of the retina?
inner posterior....image formation
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Define accomodation and what is its purpose?
bulging of lens....to focus near objects
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Define photopigment?
molecule that absorbs light, changes structure, and produces a potential
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What 2 structures contain photopigments?
rods and cones
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What is the function of the rod photoreceptor neuron?
dark vision and shape detection
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What is the function of the cone photoreceptor neuron?
light vision, sharpeness, and color
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What are the 3 major divisions of the ear?
- outer ear
- middle ear
- inner ear
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What is the structure of the outer ear
pinna > external auditory canal
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What is the structure of the middle ear?
tympanic membrane > ossicles
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what is the structure of the inner ear?
cochlea, and semicircular canals
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What is the function of the tympanic membrane and ossicles?
amplifies sound
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What sense is mediated by the cochlea?
mechanoreceptor
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What sense is mediated by the vestibule and the semicircular canal?
proprioceptor
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