Cells (Interaction and interdependence)
- Neuron structure
- cell body
- axon: long fibre
- dendrites: short fibres
- Resting potential about −70 mV
- Na⁺/K⁺ pump uses ATP
- 3 Na⁺ out, 2 K⁺ in
- K⁺ leaks out
- Action potentials
- movement of positive ions
- propagated along fibre
- Impulse speed
- wider axon faster
- myelin faster
- r and R²
- Synapses
- Ca²⁺ triggers exocytosis
- acetylcholine binds receptors
- EPSP: depolarization
- one direction only