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Mind map

Nerve Impulses

Brendan Williams Biology Undergraduate degree English

Mind map about nerve impulses: anatomy of a neurone, propagation of a nerve impulse, Schwann cells and synapse

Mind map: Nerve impulses

Map content

Nerve Impulses

Anatomy of a neurone
- Dendrons
  - Dendrites
- Axon
  - Phospholipid bilayer
  - Sodium-Potassium pump
  - Sodium ion channel
  - Potassium ion channel
- Schwann cells
  - Myelin sheath
  - Nodes of ranvier
- Synapse
  - Presynaptic neurone
    - Smooth ER
    - Mitochondrion
    - Synaptic vesicle
      - Acetylcholine
    - Ca2+ channel
    - Acetylcholine transferase
      - Choline
      - Ethanoic acid
  - Synaptic cleft
    - 20-30 nm wide
    - acetylcholinesterase
    - acetylcholine
      - Cholinergic synapse
  - Postsynaptic neurone
    - Na+ channel
      - Activated by acetylcholine
    - Inhibition
      - Cl- chanels
        Makes postsynaptic membrane more -ve
Propogation of a nerve impulse
- Resting potential, membrane polarised
  - Influx of Na+, depolarisation occurs
    - charge change causes opening of Na+ voltage-gated chanels
      - Depolarisation continues, K+ channels open and neurone behind repolarises
        Na+ removed by active transport, neurone back at resting potential
- Summation
  - Spatial Summation
    - several presynaptic neurones
  - Temporal summation
    - single presynaptic neurone firing frequently

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Description: Undergraduate degree Biology Mind Map on Nerve Impulses, created by Brendan Williams on 02/25/2014.
Created by: Brendan Williams
Views: 196
Tags: biologybiology a2
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