the nervous system Flashcards
1
Q
Describe the sensory neurone
A
- Relays messages along sensory neurone.
- Stimulus is detected by receptor cell which then sends the message to the central nervous system.
2
Q
Define relay neurone
A
Carry messages to one part of the central nervous system to another.
3
Q
Describe motor neurone.
A
Send messages from central nervous system via motor neurones to generate a response.
4
Q
What do the dendrites do?
A
Receives signals from receptor cells.
5
Q
What does the cell body do?
A
Contains the nucleus which controls the function of the cell.
6
Q
What does the axon do?
A
Transmits nerve impulses away from cell body.
7
Q
Describe a synapse.
A
- Within the axon terminals there are vesicles.
- The vesicles contain neurotransmitters.
- The neurotransmitters travel across the gap and binds with the dendrite of the other neurone.
8
Q
What is a reflex arc?
A
The pathway through the body that brings about a reflex action.
9
Q
How does a reflex arc work?
A
receptor → sensory neurone → relay neurone → motor neurone → effector
