Summary Topic 8 Neurones, Action Potentials and Synapses

Nervous
System
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