Nerve Impulses

Brendan Williams
Mind Map by Brendan Williams, updated more than 1 year ago
Brendan Williams
Created by Brendan Williams about 6 years ago
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Undergraduate degree Biology Mind Map on Nerve Impulses, created by Brendan Williams on 02/25/2014.
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Nerve Impulses
1 Anatomy of a neurone
1.1 Dendrons
1.1.1 Dendrites
1.2 Axon
1.2.1 Phospholipid bilayer
1.2.2 Sodium-Potassium pump
1.2.3 Sodium ion channel
1.2.4 Potassium ion channel
1.3 Schwann cells
1.3.1 Myelin sheath
1.3.2 Nodes of ranvier
1.4 Synapse
1.4.1 Presynaptic neurone
1.4.1.1 Smooth ER
1.4.1.2 Mitochondrion
1.4.1.3 Synaptic vesicle
1.4.1.3.1 Acetylcholine
1.4.1.4 Ca2+ channel
1.4.1.5 Acetylcholine transferase
1.4.1.5.1 Choline
1.4.1.5.2 Ethanoic acid
1.4.2 Synaptic cleft
1.4.2.1 20-30 nm wide
1.4.2.2 acetylcholinesterase
1.4.2.3 acetylcholine
1.4.2.3.1 Cholinergic synapse
1.4.3 Postsynaptic neurone
1.4.3.1 Na+ channel
1.4.3.1.1 Activated by acetylcholine
1.4.3.2 Inhibition
1.4.3.2.1 Cl- chanels
1.4.3.2.1.1 Makes postsynaptic membrane more -ve
2 Propogation of a nerve impulse
2.1 Resting potential, membrane polarised
2.1.1 Influx of Na+, depolarisation occurs
2.1.1.1 charge change causes opening of Na+ voltage-gated chanels
2.1.1.1.1 Depolarisation continues, K+ channels open and neurone behind repolarises
2.1.1.1.1.1 Na+ removed by active transport, neurone back at resting potential
2.2 Summation
2.2.1 Spatial Summation
2.2.1.1 several presynaptic neurones
2.2.2 Temporal summation
2.2.2.1 single presynaptic neurone firing frequently
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