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Copyright © 1997,
Jay Ligda. All rights reserved.
Published by Humans in
the Universe and Jay
Ligda.
The Spinal Column/Nervous System
The
nervous system
is divided into two branches, the sympathetic and the parasympathetic.
The sympathetic nervous system is responsible for response to emergency
situations that trigger the
fight-or-flight
response . The parasympathetic nervous system is responsible for
functions related to relaxation such as digestion, pupil dilation, constriction
of breathing and heart rate. Depending on the sensory input to the
brain, the hypothalamus will either switch on the parasympathetic nervous
system and allow for digestion and relaxation or it will shut off those functions
and allow energy to be used for the emergency response of the sympathetic
nervous system. The
nervous system
relays messages through neurons with neurotransmitters. The
neurotransmitters are delivered to muscle cells via
nerve fibers
and stimulate behavior.
by Jay
Ligda
(This work is a all or part of an original work first
published/written for John. F. Kennedy University: Final Integrative
Project., Mar1996.)
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References
-
Martini, F. (1992). The Fundamentals of Anatomy and
Physiology. 2nd ed. Englewood Cliffs, NJ:
Prentice-Hall.
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