Different cell types in the brain,
The neuron is what sends signals to your brai.
Dendrites collects information and it goes into the cell body, and decides wether or not it will
send the signal down the axon. (one axon per neuron)
When a nerve cell is stimulated we can have a change in the distribution of the ions.
The cell wont produece another action potention until the resting potential has been restored.
This is called the cells refractory period.
An action potention eiher occurs or it doesn’t… and if it doesn’t it occurs at full amplitude. This
A neuron is like a toilet;
An action potential takes less than 1/1000 second. You can have many actions in a row. We
sometimes call them “spikes”, we sometimes describe an AP as the neuron “firing”.
Its like dominos
AP are quite slow, and metabolically expensive. Uses way too much energy.
There are ways to make them go faster:
1. Wilder diameter axons; its easy for a squid to go down a narrow hallway than humans,
they have less neurons.
How does salutatory conduction work?
Gila wrapped around axon
Myelin (In the brain)
white matter contains myelinated axons
• Not all neurons are covered in it at birth
• Develops in different regions at different times
• Simper areas become myelinated first
• Can continue until age of 20 in areas involved in abstract thing
• Decay of myelin sheaths
• Impaired sensation and movement
• Axons are exposed and break down
• May be an autoimmune disorder What makes an action begin?
In the cell body there is a axon hillock, at the end of the axon we have
Postsynaptic on the dendrites or sometimes the cell body of the receiving neuron
Potential voltage differene
Excitatory post sunaptic potentions(like saying yes)
Inhibitory is like saying no to something
Studying the brain:
What can you do with a neuron?