I have created the best ppt on human nervous system.

7. Smarter UK
the cells of the nervous system are called neurones
cell body
axon
myelin sheath
dendrites nerve endings
nucleus
structure of a neurone

8. there are different typesof neurone
Smarter UK
sensory neuronemotor neurone relay neurone
direction of
electrical
signal
sends signals to your muscles
to tell them to move
sends signals from
your sense organs
connects neurones to
other neurones
dendrites
cell body
axon
myelin
sheath
nerve
endings

9. Smarter UK
neurones communicate with each other using a
mixture of electrical & chemical signals
cell body
axon
myelin sheath
dendrites nerve endings
nucleus an electrical
signal is
transmitted
along the axon
But what happens when the signal
reaches the end of the axon?

10. Smarter UK
cell body
axon
myelin sheath
dendrites nerve endings
nucleus the signal
is transmitted to
another neurone across a
junction called a synapse by
chemicals called
neurotransmitters.
synapse
signals cross between neurones at the synapse
neurotransmitter
vesicle
synaptic cleft
receptor

11. the signal
is transmitted to
another neurone across a
junction called a synapse by
chemicals called
neurotransmitters.
Smarter UK
cell body
axon
myelin sheath
dendrites nerve endings
nucleus
synapse
signals cross between neurones at the synapse
neurotransmitter
vesicle
synaptic cleft
receptor
electrical impulse triggers vesicles
to move to the synapse membrane
1
vesicles fuse with the membrane and
release neurotransmitter into the
synaptic cleft
2
neurotransmitter diffuses across
the cleft and binds to receptors
on the other side
3
Once enough receptors have
neurotransmitters bound to
them, the signal is
transmitted…
4

12. Smarter UK
The point where your muscles and nervous system meet is called the
neuromuscular junction (NMJ)
Signals sent from your central nervous
system to the NMJ tell muscles to move
The synapses at the NMJ
use a neurotransmitter
called acetylcholine