PY 101 Lecture Notes - Lecture 4: Parasympathetic Nervous System, Sympathetic Nervous System, Somatic Nervous System
9 Apr 2016
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Document Summary
Complex biological system designed for communication, nearly instantaneous communication, throughout the human body. Play a principle role in communication through the nervous system and bodily structures. Neurotransmitters (chemical substances) carry neural signals from one neuron to another. Connects all body organs and systems to the central nervous system. Monitors the body"s internal environment and the external environment for the brain through sensory neurons. Carries brain"s motor commands to the rest of the body through motor neurons. Autonomic nervous system- primarily involuntary control of muscles, glands, organs. Sympathetic nervous system- mobilizes organs and muscles to respond to a threat. Triggers a cascade of physiological processes designed to increase amount of oxygen to the brain and muscles. Parasympathetic nervous system- returns the body to a resting state and maintains that state until arousal is necessary. Most evolutionary ancient structures at the bottom (present in primitive animals & perform basic functions)
