Propagation Of The Nerve Action Potentialn Flashcards
How is propagation achieved?
Re-forming new action potentials along the length of axon or muscle membrane
What is the propagation of an action potential?
The movement of electrical activity down a nerve or muscle cell
What is the speed of propagation ?
It is proportional to the diameter of nerve and whether it is myelinated or not
How is nerve propagation in an unmyelinated nerve?
Nerve is from patch to patch
How is propagation down a myelinated nerve ?
It is from node-to-node
How much does myelin speed up propagation ?
100X compared to unmyelinated nerve
What is a oligodendrocyte?
Inside the central nervous system
What is a Schwann cell?
In periphery (outside of brain stem and spinal cord)
What are does of ranvier?
The only exposed membrane with sodium channels that can allow sodium ions in when stimulated
What common diseases cause demyelination of nerves?
MS and ALS
