Senses Part 1

Question 1

somatic senses

Answer 1

touch, proprioception, temperature, nociceptors (pain, itch)

Question 2

temp receptors

Answer 2

free nerve endings, cold receptors (body temp, about 45) pain receptors (activated above 45), 1mm receptive field

Question 3

thermoreceptors

Answer 3

use cation channels called transient receptor potential channels

Question 4

nociceptors

Answer 4

subjective perception, fast pain (sharp and localized by AD fibers), slow pain (fuller and more diffuse by C fibers), itch (histamine activates C fibers causing itch)

Question 5

AB (beta) classes of somatosensory nerve fibers

Answer 5

large, myelinated, mechanical stimuli (30-70m/s)

Question 6

Ad (delta) classes of somatosensory nerve fibers

Answer 6

small, myelinated; cold, fast pain, mechanical stimuli (12-30 m/s)

Question 7

C (classes of somatosensory nerve fibers)

Answer 7

small, unmyelinated; slow pain, heat, cold, mechanical stimuli (.5-2 m/s)

Question 8

nociceptors pathway

Answer 8

reflective protective response (integrated in spinal cord, withdrawal reflex); ascending pathway to cerebral cortex (becomes conscious sensation- pain or itch)

Question 9

pain modulation

Answer 9

gate control theory (AB fibers synapse on inhibitory interneurons and increase inhibition)

Question 10

integrated response from AB and C fibers decrease…

Answer 10

perception of pain