Biopsychology- The Structure & Functions of Neurons
- Created by: odavid601
- Created on: 10-06-19 04:20
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- Neurons
- Types & Functions
- 100 billion nerve cells in our body
- 80% are in the brain
- Provide the nervous system with its primary means of communication by transmitting signals chemically & electrically
- Motor neurons connect the CNS to effectors such as muscles and glands.
- Have long axons & short dendrites
- Sensory Neurons- carry messages from the PNS —> CNS
- Short axons and long dendrites
- Relay Neurons connect sensory neurons to motor or other relay neurons
- Short axons & short dendrites
- 100 billion nerve cells in our body
- Structure
- Cell Body- includes the nucleus which contains the genetic material of the cell
- Dendrites- carry nerve impulses from neighbouring neurons towards the cell body
- Axon- carries electrical impulse away from the cell body down the length of the neuron
- Myelin Sheath- fatty layer that protects the axon
- Nodes of Ranvier- gaps in the axon that speed up the transmission of the impulse.
- Terminal Buttons- end of axon communicate with the next neuron in the chain across the synapse
- Electrical Transmissions
- @ Resting state the inside of the cell is -vely charged compared to the outside
- When neuron is activated it is +ly charged for a split second causing an action potential to occur
- This create an electrical impulse that travels down the axon towards the end of the neuron
- Types & Functions
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