B1d Part 2 The Nervous System Flashcards
1
Q
CNS
A
Central nervous system
2
Q
Dendrites
A
Branched endings
3
Q
Effector
A
E.g a muscle
4
Q
Neurone
A
A nerve cell
5
Q
Peripheral
A
Around the outside
6
Q
Receptor
A
E.g. Light sensitive cells
7
Q
Reflex
A
Reaction
8
Q
Sheath
A
Insulating later around the axon
9
Q
Spinal cord
A
Part of the CNS
10
Q
Synapse
A
Gap between 2 neurons
Electrical signals pass
A nerve impulse triggers the release of neurotransmitter molecules from the end of the neurone
The neurotransmitters diffuse across and bind with receptors on the next neurone - allowing the impulse to continue
11
Q
Stimulus
A
E.g. Pain
Heat
Light
Sound
12
Q
Transmitter substance
A
Found in synapse
Diffuses across the synapse
Binds with receptors
13
Q
Voluntary response
A
Under your control
14
Q
Nerve impulses …
A
(Electrical signal) pass along the axon if the neurone
15
Q
Adaptations of neurone
A
Long axon Branched endings (dendrites) Insulating sheath(speeds up nerve impulses)
