week 4 part 1

Question 1

chemoreceptors

Answer 1

chemical concentrations

Question 2

a fibers

Answer 2

part of nociceptors and they detect sharp localized pain

Question 3

c fibers

Answer 3

dull, burning delayed pain

Question 4

as diameter increase

Answer 4

conduction rate also increase

Question 5

how is stimulus intensity duration signaled

Answer 5

if you increase the duration and amplitude of the stimulus there will be an resulting increase of the firing rate and increases the neurotransmitter release

Question 6

tonic receptors

Answer 6

slowly adapt to continual situlation

Question 7

phasic receptors

Answer 7

rapidly adapt to continual stimulation then are reactivated when stimulus ends

Question 8

what do cutaneous receptors under the skin do

Answer 8

provide information about vibration, pressure and temperature

Question 9

what is the receptive field

Answer 9

includes sensory neuron it encompasses the spatial extent of the receptors surface from which the sensory neuron receive input

Question 10

what is eh hot spot

Answer 10

the most sensitive within the receptive field

Question 11

superficial receptors type 1

Answer 11

have smaller receptive fields
- have multiple points of maximal sensitivity

Question 12

deep receptors (type 2)

Answer 12

have larger receptive fields
- only have one hot spot

Question 13

Polysynaptic pathways

Answer 13

mediate flexion and cross-extension reflexes

Question 14

merkel cells

Answer 14

superfical Slow Adapting1
-highly sensitive to curvature and edges
-small receptive field with multiple hot spots
25%

Question 15

merkel cell thresholds

Answer 15

moderatley low threshold
-irregular discharge when stimulated

Question 16

Meissner corpuscle

Answer 16

superficial fast adapting
- stroking velocity or motion across skin
(cold beer falling through you fingers)
-small receptive field with multiple hot spots
~ 40%of innervation

Question 17

meissner corpuscle threshold

Answer 17

low threshold
sensitive to low frequency vibration

Question 18

ruffini

Answer 18

deep slow adapting 2
skin stretch
-large receptive field with only one hot spot
-20%

Question 19

ruffini threshold

Answer 19

high threshold to indentation
low frequency

Question 20

pacinian corpuscle

Answer 20

deep fast adapting
vibrations through an object

Question 21

pacinian corpuscle

Answer 21

large receptive filed with only one hot spot
-15% of hand
-very low threshold