Greetings. In this lecture, we will be covering the autonomic nervous system.
Recall that the nervous system can be divided into two functional categories.
You have the somatic nervous system which is going to include both sensory and motor neurons.
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.
In the somatic nervous system, the motor neurons are going to innervate our skeletal muscles.
The second division is the autonomic nervous system.
In this division, we receive input from sensory receptors
located in the organs of the blood vessels, muscles, and the nervous system.
The autonomic nervous system can be further subdivided into two different subdivisions.
First, the sympathetic nervous system is going to be our fight-or-flight position.
This is the division that is activated if you are all of a sudden been chased by a bear.
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.
The second subdivision is the parasympathetic nervous system.
This is our rest-and-digest division.
Its stimulation is going to slow down most of the body's activities.
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.