Reflexes

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26 Terms

1

reflex

comparatively simple automatic response to a stimulus

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2

reflex arc steps

receptor sensory relay integration motor command relay effector

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3

monosynaptic reflexes

faster and integrated into the spinal cord

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4

monosynaptic reflex example

knee jerk

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5

polysynaptic reflex

at least one interneuron involved

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6

somatic reflex

voluntary involving skeletal muscle

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7

autonomic reflex

reflex that involves smooth muscles, glands, or visceral organs

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8

acquired reflexes

reflexes that are learned through experience

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9

exteroceptors

general sensory receptors that monitor external conditions like heat, cold, pain, pressure

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10

interoceptors

sensory receptors that monitor internal conditions

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11

chemoreceptors

monitor blood pH

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12

visceral stretch receptors

monitors distension of visceral organs

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13

proprioceptors

monitor postural info

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14

free nerve endings

dendrites terminate in epidermic/dermis junction and surrounding tissue; detect pain

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15

merkel cells

associated with free nerve endings; detect light touch

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16

meissner's corpuscles

more superficial encapsulated receptors; detect light touch

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17

pacinian corpuscles

deeper encapsulated receptors; detect forceful pressure

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18

proprioception

sense of body movement and position

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19

muscle spindle

monitor muscle position to ensure muscles don't overstretch

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20

intramural fibers

located in extramural skeletal muscle fibers

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21

alpha-motor neurons

innervate contractile region of extramural fibers

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22

gamma-motor neurons

innervate contractile region of intramural fiber

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23

willful muscle contraction

brain-> gamma-motor neurons to contract the intramural fibers, relieving compression of spindle

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24

receptor transducing function

convert stimuli to action potentials

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25

adaptation

desensitization to constant stimuli

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26

sensitive receptor field

smaller, more dense receptor field

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