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The Nervous System:

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by

Melissa Rogers

on 12 October 2016

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Transcript of The Nervous System:

Action Potential
A neural impulse; a brief electrical charge that travels down the axon

2-200 mph depending on type
Within Neuron Communication
The study of the
mind
and behavior

Psychology = Science

Why? How?
But, this isn't Biology class....



Neuron- A nerve cell; the basic building
block of the nervous system
Credits
http://mitadmissions.org/blogs/entry/neurony_goodness
http://apcentral.collegeboard.com/apc/public/courses/teachers_corner/2265.html
http://www.mind.ilstu.edu/curriculum/neurons_intro/neurons_intro.php
https://faculty.washington.edu/chudler/ap.html
http://www.brainfacts.org/brain-basics/neuroanatomy/articles/2012/the-neuron/~/media/Brainfacts/Article%20Multimedia/Brain%20Basics/Neuroanatomy/Neuron%20Illustration%20Large.ashx
https://www.boundless.com/psychology/the-brain-and-behavior/neurons/neural-impulses/
http://www.darpa.mil/uploadedImages/Content/NewsEvents/Releases/2013/SUBNET_Final_1.jpg
http://www.thethirdsource.org/wp-content/uploads/neuron.gif
http://www.sparknotes.com/psychology/psych101/thebrain/section2.rhtml
http://ashleysbiostudyguides.wordpress.com/2013/04/20/animal-and-plant-homeostasis-and-physiology-study-guides/
Activity
Break up into no more than 6 small groups.

Make sure you have at least 3 people in a group.

Grab a bag of Dominoes when your group is ready!
Resting Potential
Refractory Period
The time period in which the neuron
cannot fire again until the ions have
returned to the resting potential
state.

Measured in milliseconds (1/1000)
All or None Law
A neuron either fires or it doesn't.
Once the impulse has been started, it cannot be stopped.

Depolarization
The point at which the impulse is strong enough for the neuron to recognize it and set off a chain reaction.

-55 to -60 mV
Threshold
Between threshold and action potential

Sodium ion exchanging with potassium ions

Polarity reverses, travels down the axon, relaying the signal.

Repolarization
Between action potential and refractory period

Sodium channels close, potassium channels open

Polarity starts to return to resting potential state

Speed is an incorrect answer
Different types of neurons have different speeds,
but a neuron will always fire at the same speed.
Poll Answer Elimination:
Quantity?
Speed
Strength?
Strength is not the correct answer.
Neurons fire with the same
strength every time.
Poll Answer Elimination:
Quantity?
Speed?
Strength?
The state at which a neuron is "at rest."
Not firing any impulses

Resting Potential = -70mV
1.5 volts
Refractory Period
The neuron is intent on getting rid of the sodium, so much so that its charge is more negative than at resting state. It then brings more potassium back in.
Unit 03: Biological Bases of Behavior
Full transcript