nervous system Flashcards
1
Q
CNS?
A
brain/spinal cord
2
Q
PNS?
A
comprised of other nerves and orgains
3
Q
what are features of the motor neurone cell?
A
dendrites
cell body
nucleus
axon
myelin sheath
axon terminal
synaptic bulbs
4
Q
what is a stimulus ?
A
heat from object
5
Q
role of a receptor ?
A
detects a stimulus which creates a nerve impulse in a sensory neurone
6
Q
role of a sensory neurone ?
A
pass impulse from receptors to CNS
7
Q
role of relay neurone ?
A
links sensory neurone to motor neurone in spinal cord
8
Q
role of motor neurone ?
A
carries impulse from CNS to effectors
9
Q
role of effector ?
A
the muscle which is stimulated to contract
10
Q
role of a response ?
A
for example of someone is touching a hot object it will send a message for the hand to be pulled away from the object
11
Q
steps of a synapse?
A
- action potential reaches axon terminal
- calcium ions enter pre-synaptic knob
- causes vesicles filled with neurotransmitters to move and release into synaptic cleft
- neurotransmitters diffuse across gap and bind to receptors
- triggers action potential
