Nerve Impulses
- Created by: Sophia Dowden
- Created on: 10-06-16 21:41
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- Nerve Impulses
- Neurons transmit electrical impulses along the axon.
- Ions move IN and OUT electrical impulses along the axon.
- Nerve impulses consist of;
- 1) Resting potential
- Polarised membrane
- 2) Action potential
- depolarised membrane
- 3) Refractory Period
- Repolarised membrane
- 1) Resting potential
- Resting potential
- The potential difference (electrical charge) between the inside/outside of the axon membrane, when a nerve impulse is not being conducted
- Membrane is said to be polarised
- Fewer ions inside compared to the outside
- Membrane is said to be polarised
- How resting potential is created
- Na+ ions are actively pumped out faster than K+ ions are pumped in; 3Na+ pumped out and 2K+ pumped in.
- Protein pumps - in the axon membrane use active transport to pump Na+ out of the axon and K+ into the axon sodium-potassium pump.
- K+ channels remain open, therefore there is higher permeability to K+, K+ diffuses out and more rapidly then Na+
- Membrane is more permeable to potassium
- The potential difference (electrical charge) between the inside/outside of the axon membrane, when a nerve impulse is not being conducted
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