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Neuron System (Structure (Axon (Long fiber that sending a signal (action…
Neuron System
Structure
Cell Body
Having the nucleus and most of the cytoplasm.
Dendrites
Receiving the signals (action potentials)
Axon
Long fiber that sending a signal (action potential)
Working like a wire
Myelin Sheath
A membrane that surrounds the axon in some neurons
Helping speed up the signal (Action Potential)
Node of Rainiver
Axon terminal
Schwann cell
Meylin
Nucleus
Action Potential
Step 1: Threshold reached
The strength a stimuli needs to be in order to cause an action potential
Step 2: Sodium let into cell
The gap between two neurons.
Step 3: Action potential travels down axon
Step 4: Action potential reaches axon terminal
Step 5: Neurotransmitter released and the next neuron is activated
A chemical that is activated by an action potential and sends the signal to the next neuron.
Types
Peripheral Nervous System
Part of the nervous system that is not the brain or spinal cord
Central Nervous System
Part of the nervous system that includes the brain and spinal cord
Resting Potential
When a neuron rests and nothing happens
Voltage
-70 milivolts