Central Nervous System
- Created by: Jennifer007
- Created on: 06-05-20 22:51
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- Central Nervous System
- Types Of Neurons
- Sensory Neurons:Carry messages from sensory receptors along the nerves in the PSN to the CNS.
- Motor Neurons; Carries messages from the CNS to effectors such as muscles and glands
- Relay neurons: Connect sensory and motor neurons together, and also connect to other relay neurons
- Function Of The Neurons
- When activated by a stimulus, the inside of a neuron becomes positively charged for a split second
- The rapid switch from negative to positive is called depolarisation
- An electrical impulse is created from the axon to the terminal buttons.
- AP is generated once depolarisation reached the threshold and is always the same intensity, regardless of the size of stimuli
- AP = Action Potential
- When activated by a stimulus, the inside of a neuron becomes positively charged for a split second
- Synaptic Trasmission
- Signals within neurons are transmitted elecrically, BUT signals between neurons are transmitted chemically across the synapse
- Once the AP reaches the end on the neuron, it triggers the release of neurotransmitters from the synaptic vesiles
- When the neurotransmitter reaches the end of the synapse, it has to fit in the receptor sites of the post synaptic neurons.
- The transmitters which do not reach the postsynaptic receptors are reabsorbed
- Types Of Neurons
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