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NERVOUS SYSTEM (Neurons (Parts (Axon (Transmit info+ to other neurons,…
NERVOUS SYSTEM
Neurons
Specialised cells
To carry nervous impulses
Parts
Cell body
Form grey matter
Contains organelles
Dendrites
Branch that connect with +++ neurons
Recieve info+
Myelin sheath
Axon
Transmit info+ to other neurons
Groups of axons = nerves
Form white matter
Types
Interneurons
Make up central nervous system
Connect motor & sensory neurons
Motor neurons
Carry message from central nervous system
To efectors --> muscles, glands ....
Sensory neurons
Carry messages from receptors
To central nervous system
Nerve impulse (it)
What is it?
An electrical signal
Travels through neurons
From dendrites to axon
How it works?
It travels to end of axon
Reaches the synapse (junction between neurons)
Sodium ions (outside) exchange with potassium ions (inside)
Neurotransmitters allow them to pass to ther neuron