The Neuron
Published on Nov 19, 2015
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PRESENTATION OUTLINE
THE NEURON
A Neuron is a nerve cell, which consists of many different parts. Neurons form our bodies communication system.
Photo by Ame Otoko
The Parts
1. Dendrites- receive messages from other cells
The Parts
2. Axon- passes messages to muscles, glands and other neurons
Photo by lednichenkoolga
The Parts
3. Soma- cells life support
The Parts
4. Myelin Sheath - enables vastly greater transmission of impulses
Action potential
A neural impulse
A brief electrical charge that travels down an axon
Threshold- stimulation required to trigger an impulse. Greater impulse releases the trigger
Example
People who want to party-25
People who want to study-13
"Party" impulse is released
A Refractory Period is when the neuron fires an action potential and then pauses in order to recharge itself to fire again
Photo by jimbowen0306
Communication
Neurotransmitter- messengers that cross between neurons
- bind to receptors and influence whether that neuron generates an impulse
Communication
Reuptake- the sending neuron reabsorbs the excess neurotransmitter
Alcohol and Drugs
Mimic neurotransmitters
Constant use causes body to stop creating own neurotransmitters
Called agonists and antagonists
Agonist- similar enough to a neurotransmitter to bind to its receptor and mimic effects
Antagonists- bind to receptors but block neurotransmitters function
http://youtu.be/FVo04B0_5R4
18 seconds-4:45 seconds
Photo by @yakobusan Jakob Montrasio 孟亚柯
