Summary
Summary Topic 8 Neurones, Action Potentials and Synapses
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Edexcel Biology Topic 8 Neurones, Action Potentials and Synapses
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NervousSystem
Nervous System
S.I units
Peripheral Central
nervous Nervous
system ⑤
System G
Sensory Motor Reaptors brain Spinal
Neurones Neurones
Effectors card
Muscles
glands
PNS
Voluntary (sheletal muscles)
O
Autonomic
Sympathetic Parasympathetic
Pupil increase Increase Restful state
dilution HR
breathing rate digestion
Sensory
the
Neurone
CNS .
-
carries action potential from receptor to
, Motor action potential from relay
neurone
-
carries neurone
to an
effector (muscles +
glands)
Structure :
Newore
S.I units
branched cell membrane
>
- = dendrites
-
with wher
-
forms Synapses
⑨
- neurons
-
takes action potentials
towards he cell body
axon hillock
* Apstarts here
rodes
fatty layer-myelin
axon
so
which increases
a
speed of action potential
Axon
potentially action
metres
long
> -
potentials
propagateistances
Yog
long action potentials away
-
from cell body
Action
Potential : -Nerve impulse e
propagated along the axon.
-
To have an action potential
Stimulus
intensity) Threshold
All or
Nothing: All action
action potentials are same
-
size -
just more potentials
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