Neuroscience. Flashcards
A proto neuron is…
Highly polarised.
The role of glia?
Mediate signals, support neutrons and have the ability to divide.
What is grey matter?
Nerve cell body out of the brain, e.g. cortex, basal nuclei
What is white matter?
Axon and myelin (inner brain) and the spinal cord
Role of an axon and dendrite?
Axon = transmits information Dendrite = receives information
Explain an action potential…
Resting cell membrane (polarised) > protein outside the cell and Sodium inside > Sodium channels open, allowing sodium to enter the cell (depolarisation) > A reverse in electrical potential > Sodium channels close and Potassium channels open (repolarisation)
What is myelin?
Electrical tape insulating an axon that prevents Sodium dissipating out of the cell during an action potential.
What is myelin sheath?
Degrades damage and reduces axon conduction when Myelin is attacked by the immune system.
What is a synapse?
A junction between neurons.
