bio psychology structure and function of neurons
- Created by: cieran32
- Created on: 19-09-18 22:25
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- structure and functions of neurons
- three types of neurons
- sensory neurons- carry signals from receptors to the spinal cord and brain
- Relay neurons- carry messages from one part of the CNS to another
- Motor neurons- carry signals from the CNS to effectors muscles or glands
- synapse - the site where an axon terminates at a target cell
- when the depolarised signal reaches the synapse it releases neurotransmitters
- gap at the end of the axon and the target cell
- These receptors are coupled with ion channel proteins. - controlled by receptor
- neurotransmitters- signalling molecules used at the synapses to pass a signal from a neuron to its target cell
- Receptors at the target cell which the neurotransmitter binds to
- Neurotransmitters diffuse across from the axon to the target cell
- when the neurotransmitter binds to the receptor the ion channels open. only specific type of ion is allowed in.
- Excitory Neurons- if it is an excitory neuron (signalling neuron) the ion channel will allow sodium ions (na+) to enter the cell and depolarisation to occur
- Inhibitory neurons - if the signalling neuron is inhibitory a different ion channel will open and allow negatively charged ions such as CI- to enter the cell. increase the polarisation and decrease the channel plarisation
- three types of neurons
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