Topic 19: Nervous System - PNS - Sensory division - receptors Flashcards
1
Q
After a stimulus, what happens?
A
stimulus -> receptor -> CNS
2
Q
What two structures does the sensory division include?
A
- receptors
- first order neurons
3
Q
What do receptors do?
A
- detect changes in the environment
4
Q
How are receptors classified by? (3)
A
- location
- type of stimulus received
- structure of receptor (general senses only)
5
Q
What are exteroreceptors? (2)
A
- stimulus in external environment
- ex. receptors at body surface
6
Q
What are interoreceptors?
A
- stimulus in internal environment
ex. in viscera. blood vessels, etc.
7
Q
What are proprioceptors?
A
- in joints, skeletal muscle, etc.
8
Q
What do proprioceptors monitor? (2)
A
- body position (stretch receptors, muscle spindles)
- balance and movement
9
Q
Name the 3 types of stimulus receptors (5)
A
- mechanoreceptors
- thermoreceptors
- chemoreceptors
- photoreceptors
- nocireceptors
10
Q
What are mechanoreceptors?
A
- mechanical stimuli (pressure, touch, hearing)
11
Q
What are thermoreceptors?
A
- temperature
12
Q
what are chemoreceptors?
A
- chemical
13
Q
What are photoreceptors?
A
light
14
Q
What are nocireceptors?
A
- pain
15
Q
What are free nerve endings?
A
- terminal dendrites of unipolar neurons
ex. pain, root hair plexus
