11 Sensory Receptor Mechanisms and Central Processing Flashcards Preview

Physiology Test 1 > 11 Sensory Receptor Mechanisms and Central Processing > Flashcards

Flashcards in 11 Sensory Receptor Mechanisms and Central Processing Deck (30)
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1
Q

exteroreceptors

A

convey information about the external environment

2
Q

interoreceptors

A

convey information about the internal environment

3
Q

sensory modality

A

differentiates one type of sensation from the others

4
Q

the receptor for pain is

A

naked nerve endings

5
Q

this sensation (modality) responds to mechanoreceptors, thermoreceptors, and nocioceptors

A

pain

6
Q

sensory unit

A

a single sensory nerve and the receptor/receptors to which it responds

7
Q

receptive field

A

area of response for the receptor(s) in each separate sensory unit

8
Q

transduction

A

converting energy of the stimulus into electrical energy in the nervous system

9
Q

adequate stimulus

A

the specific stimulus that normally activates a particular type of sensory receptor (i.e. the visual spectrum); it produces a graded electrical potential in the receptor

10
Q

generator potential

A

when the receptor is the sensory nerve ending itself

11
Q

receptor potential

A

when the receptor cell is non-neural

12
Q

all or none action potential

A

generator potential depolarizes sensory nerve beyond threshold

13
Q

pacinian corpuscle consists of

A

free nerve surrounded by layers of connective tissue

14
Q

pacinian corpuscle responds to

A

touch and pressure

15
Q

deforming a pacinnian corpuscle causes___

A

Na+ channels to open, influx of Na+, depolarization

16
Q

receptor potentials may be ____ or _____

A

hyperpolarizing or depolarizing

17
Q

sensory adaptation/accommodation

A

when receptor potential declines due to continued pressure

18
Q

phasic/velocity receptors

A

quickly adapting; identify the rate at which a stimulus changes

19
Q

the pacinian corpuscle is a ____ receptor

A

phasic

20
Q

tonic/intensity receptors

A

slowly adapting; fire for as long as the stimulus is applied, show slow adaptation; i.e. pain signals, proprioceptors in muscles, tendons, and ligaments

21
Q

the amplitude of the generator or receptor potential is proportional to the ____ of the stimulus strength

A

logarithm

the receptor can respond to a very wide range of stimuli

22
Q

intensity of stimulus is determined by

A

the frequency of firing of nerve action

23
Q

population code says

A

the stronger the stimulus, the more receptors activated

24
Q

e.g. first order neuron

A

DRG (dorsal root ganglion)

25
Q

e.g. second order neuron

A

dorsal column nuclei

26
Q

receptive field first order neuron

A

area on skin where applied pressure excites the neuron

27
Q

second order neuron

A

dorsal column nuclei - receptive field changes shape and now has an excitatory center with inhibitory surround

28
Q

lateral inhibition

A

to enhance the boundaries of contrast between incoming sensory signals; a region of excitation surrounded by a inhibition

29
Q

third order neuron

A

thalamus

30
Q

generator potential

A

may generate a train of action potentials