6.5 Neurons and synapses
- Created by: alllllllllllllllll
- Created on: 18-05-18 18:34
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- 6.5 Neurons and Synapses
- Neurons
- individual cells that transmit electrical impulses
- nerves are bundles of neurons
- CENTRAL NERVOUS SYSTEM -- brain & spinal cord
- 3 types of neurons
- MOTOR
- SENSORY
- RELAY
- IMPULSE
- Resting potential
- Na+ pumped out of axon by active transport
- K+ pumped into axon
- - charged proteins remain inside
- Cytoplasm negative charge
- area outside axon has + charge
- 70mV
- Depolarisation
- when impulse reaches axon, sodium channels open letting Na+ diffuse into axon
- Na+ movement passive
- +30mV
- Repolarisation
- Na+ channels close
- K+ channels open
- Resting potential
- Saltatory conduction
- occurs in myelinated axons
- myelin sheath acts as insulator
- Synapses
- Junctions between neurons
- Information passed between neurons by neurotransmitters
- Neurons
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