Communication Neurobiology - Graded and action potential
6 important questions on Communication Neurobiology - Graded and action potential
What are the 4 steps of a graded potential?
- Stimulus depolarizes the cell membrane
- Decrement: signal weakens by diffusion throughut cytoplasm and leakage through cell membrane
- Axon hillock; depolarisation threshold results in action potential
What are the 4 steps of the action potential?
- Resting state= all gated channels closed
- Depolerising phase= Na channels open
- Repolarizing phase= Na channels inactivating, K channels open
- Hyperpolarization= K channels remain open, Na channels resetting
What is a refractory period?
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What is the difference between the two types of axons?
What are the two types of synapses?
- Electrical synapse
- Chemical Synapse
What are the 8 communication steps in the chemical synapse?
- Arrival action potential
- Opening Ca channel &influx Ca in presynaptic neuron
- Exocytosis neurotransmatter
- Binding neurotrasmitter to receptor postsynaptic neuron
- Reaction postsynaptic neuron
- Neurotransmitter is degraded or
- Taken up and/or
- Diffuses out of the synaptic cleft
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