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Greetings. In this lecture, we will be covering the autonomic nervous system.
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Recall that the nervous system can be divided into two functional categories.
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You have the somatic nervous system which is going to include both sensory and motor neurons.
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These sensory neurons are going to be related to touch, pain, temperature, and proprioception
or your sense of self position as well as sight, hearing, taste, smell, and equilibrium.
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In the somatic nervous system, the motor neurons are going to innervate our skeletal muscles.
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The second division is the autonomic nervous system.
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In this division, we receive input from sensory receptors
located in the organs of the blood vessels, muscles, and the nervous system.
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The autonomic nervous system can be further subdivided into two different subdivisions.
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First, the sympathetic nervous system is going to be our fight-or-flight position.
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This is the division that is activated if you are all of a sudden been chased by a bear.
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Its stimulation is going to lead to an increase in alertness and metabolism
so that we're ready for an emergency such as running from a bear.
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The second subdivision is the parasympathetic nervous system.
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This is our rest-and-digest division.
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Its stimulation is going to slow down most of the body's activities.
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This is going to be activated if the bear is outside and you're inside your cabin,
and you're not worried about being eaten.