Chapter 46: Sensory Systems Flashcards

1
Q

first step of sensory transduction

A

change in the membrane potential of the receptor cell in response to specific type of stimulus

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2
Q

receptor potential

A

change in the membrane potential of a receptor cell

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3
Q

ionotropic sensory receptors

A

mechanoreceptors, thermoreceptor, electroreceptors

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4
Q

metabotropic sensory receptors

A

chemoreceptor, photoreceptor

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5
Q

adaptation

A

enables an animal to ignore background or unchanging conditions while remaining sensitive to changes and new information

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6
Q

chemoreceptors

A

receptor proteins that bind to specific molecules and are responsible of smell and taste

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7
Q

olfaction

A

the sense of smell, dependent on chemoreceptors

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8
Q

olfactory bulb

A

olfactory integration area of the brain

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9
Q

odorant

A

molecule in the environment that binds to and activates an olfactory receptor protein on the cilia of olfactory receptor neurons

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10
Q

pheromone

A

specialized chemical signal used for communication among individuals of the same species

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11
Q

gustation

A

sense of taste, dependent on taste buds (chemoreceptors)

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12
Q

mechanoreceptors

A

respond to mechanical forces

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13
Q

merkel’s discs

A

adapt rather slowly and provide continuous information about anything touching the skin. most important tactile receptors

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14
Q

meissner’s corpuscles

A

very sensitive, adapt rapidly, provide information about changes in things touching the skin

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15
Q

ruffini endings

A

deeper in the skin, adapt slowly and are good at providing information about vibrating stimuli of low frequency

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16
Q

pacinian corpuscles

A

adapt rapidly, provide information about vibrating stimuli of higher frequencies

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17
Q

muscle spindles

A

stretch receptors. modified muscle cells embedded in connective tissue inside muscles and innervated by sensory neurons

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18
Q

golgi tendon organ

A

type of mechanoreceptor.
found in tendons and ligaments
provides information about the force generated by a contracting muscle

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19
Q

hair cells

A

mechanoreceptor for the vertebrate auditory system and vestibular system. ( Sound perceiving and equilibrium-maintaining systems)

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20
Q

stereocilia

A

fingerlike projections of the cell membrane stiffened by cross-linked actin filaments

21
Q

tympanic membrane

A

covering the end of the auditory canal
vibrates in response to pressure waves traveling down the canal, converting the pressure waves to physical forces in the middle ear

22
Q

eustachian tube

A

filled with air, pressure equilibrates between the middle ear and the enviornment

23
Q

ossicles

A

composed of the malleus, incus, and stapes

transmits the vibrations of the tympanic membrane to oval window

24
Q

oval window

A

receives vibrations from stapes. pressure is now 20x greater than at tympanic membrane

25
vestibular canal
part of the inner ear. organ of balance
26
cochlea
part of the inner ear, organ hearing. long tapered coil structure. composed of vestibular membrane and the basilar membrane
27
organ of corti
sits on the basilar membrane | traduces pressure waves into action potentials
28
round window
flexible membrane at the end of the tympanic canal
29
flexions
traveling waves
30
cupula
gelatinous swelling enclosing a cluster of hair cell stereocilia
31
rhodospin
vertebrate visual pigment | consists of opsin(protein) and 11-cis-retinal (light absorbing functional group)
32
eye cups
organized photoreceptor cells
33
ommatidia
optical unit, with its own narrow-angle lens
34
sclera
spherical, fluid filled structure bounded by a tough connective tissue layer
35
cornea
at the front of the eye formed by sclera transparent to allow light in
36
iris
just inside the cornea gives the eye its color controls the amount of light that reaches the photoreceptor cells at the back of the eye
37
pupil
central opening of the iris
38
lens
crystalline protein | makes fine adjustments in the focus of images
39
retina
photosensitive layer
40
the two photoreceptors of the vertebrate retina
rod and cone cells (both modified neurons)
41
rod cells
highly light-sensitiveand perceive shades of gray in dim light 3 segments: outer, inner, and synaptic terminal
42
cone cells
``` function at high levels responsible for high-acuity color vision ```
43
fovea
area of the retina that receives light from the center of the visual field
44
optic nerve
formed by the axons of ganglion cells
45
ganglion cells
closest to the lens | fire action potentials
46
bipolar cells
connect ganglion cells to photoreceptors | rate of neurotransmitters released from the bipolar cells determines the rate that ganglion cells fire action potentials
47
horizontal cells
form synapses with neighboring photoreceptors and bipolar cells
48
amacrine cells
form local interconnections between bipolar cells and ganglion cells. some highly sensitive to motion or to changing illumination