022414 2 Sensory Receptors Flashcards Preview

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Flashcards in 022414 2 Sensory Receptors Deck (26):
1

What are the 6 type II (A-beta) mechanoreceptors?

PR-TH-MM
pacinian corpuscles
ruffini endings
tactile disk
hair follicle receptors
meissner corpuscles
merkel discs

2

A muscle spindle organ involves either type ____ or type _____ nerve fibers.

type I(a)
type II

3

What mechanoreceptors are located in hairy skin?

PR-TH
pacinian corpuscle
ruff ini ending
tactile disk
hair follicle

4

What mechanoreceptors are located in hairless skin?

MM
meissner corpuscle
merkel disc

5

What do ruffini endings detect?

stretching and shapes

6

What do tactile disks detect?

pressure (very sensitive because they are near the surface)

7

What do pacinian corpuscles detect?

vibration and touch

8

What do pacinian corpuscles, meissner corpuscles and merkel discs all detect?

tactile (touch)

9

Muscle spindle organs are involved in proprioception. T or F?

T

10

What do nociceptors detect?

pain
tissue damage

11

TRPV1 is an example of a _______. It responds to ions directly and chemicals indirectly via a G coupled protein.

Nociceptor

12

What is the difference between rapidly adapting and slowly adapting mechanoreceptors?

Rapidly adapting are turned on and off by the beginning and end of a continuous stimulus. Slowly adapting are turned on by the beginning of a stimulus, and their action potential frequency gradually decreases.

13

What is accommodation?

decreased response to persistent action potential

14

What types of nerve fibers are myelinated?

type I (A-alpha)
type II (A-beta)
type III (A-delta)

15

What types of nerve fibers are demyelinated?

type IV (C)

16

What do type I (A-alpha) nerve fibers detect?

proprioception

17

What do type II (A-beta) nerve fibers detect?

touch
pressure
vibration

18

What do type III (A-delta) nerve fibers detect?

fast pain
cold

19

What do type IV (C) nerve fibers detect?

slow pain
warmth

20

What type of nerve fiber has the fastest conduction velocity? Slowest?

fastest: type I (A-alpha)
slowest: type IV (C)

21

In the muscle spindle organ, what types of nerve fibers wrap around the intrafusal fibers, detecting stretch?

type I(a) or type II

22

In the muscle spindle organ, what types of nerve fibers are tethered to the peripheral ends of the muscle spindle organ, causing contraction after stretch is detected?

gamma efferent axons

23

What is the difference between what muscle spindle organs detect and what golgi tendon organs detect?

muscle spindle organs detect stretch
golgi tendon organs detect stretch and contraction

24

In the golgi tendon organ, what type of nerve fibers are intertwined in tendon collagen so that when muscles stretch or contract, action potentials are fired?

type I(b)

25

What do anesthetics block? What type of fibers are blocked first?

voltage gated sodium channels
C fibers (small diameter)

26

During the application of pressure or hypoxia, what type of nerve fibers are blocked first?

A fibers (type I-III) (large diameter)