Ch.3 Reaction Paper

Ch.3 Reaction Paper - Melissa Fuller PS101 A February 7,...

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Melissa Fuller PS101 A February 7, 2008 Brain cells communicate by means of neurons. There are three types of neurons; they are motor, sensory, and interneurons. Neurons can be found in glial cells which provide nourishment, insulation, damage repair and help support then in their functions. Signals travel along a network in the form of electric impulses. The impulses move along the threadlike axon of one of the neurons to the terminal buttons at the end of that axon. A myelin sheath of fat and protein wraps around the axon to prevent messages from short circuiting one another. It also increases the electric impulse velocity that travels through the axons. Axons that carry extremely important messages have the most myelin. For example, if someone is stepping on your hand the pain message is though the axons in your hand, up your arm and to the brain urgently so you can tell the person to off your hand. So the axons that went through you hand and arm have a thick covering of myelin allowing you to react almost instantly. Neurons are not connected to one another, there is a space between axons that the
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This essay was uploaded on 04/16/2008 for the course PS 101 taught by Professor Lesniewski during the Spring '08 term at Mount Ida.

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Ch.3 Reaction Paper - Melissa Fuller PS101 A February 7,...

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