Psychpaperch4 - feet in length Most axons receive...

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Greg Dobson PY.101.32 Dr. Lane Chap. 4 Paper Basic neurophysiology and communication of the neuron. The neuron has three main parts: dendrites, a cell body, and an axon. The dendrites resemble the branches of a tree that act like antennas. These branches receive messages from the thousands of other nerve cells, and do some preliminary processing of the messages, while transmitting them toward the cell body. The cell body is somewhat spherical or pyramid shaped and contains the biochemical machinery for keeping the neuron alive. Furthermore, its job is to determine whether the neuron should fire out a message to other neurons depending on the input it receives from the other neurons. The axon transmits messages away from the cell body toward other neurons, muscle, or gland cells. At the end of the axon it divides into several branches known as axon terminals. In adults axons have been recorded ranging from 4/1000 inches to a few
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Unformatted text preview: feet in length. Most axons receive insulation from a layer of fatty material surrounding them called the myelin sheath. In the central nervous system this insulation is comprised of glial cells. Within the insulation small constrictions known as nodes divide it into segments. The myelin sheath provides the neuron with the ability to prevent signals in adjacent cells from interfering with each other. Also, its structure allows the conduction of neural impulses to accelerate. For these two reasons the insulation around our axon is crucial for a healthy, sustainable life. Without it erratic nerve signals can lead to loss of sensation, weakness, paralysis, lack of coordination, and weakened vision. The combination of dendrites and axons give neurons not one job, but two. More simply put, a neuron is first the “catcher” and then the “batter.”...
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