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autonomic nervous system |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.06 sec. |
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autonomic nervous system: see nervous system nervous system, network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of the animal kingdom have at least a rudimentary nervous system. ..... Click the link for more information. . autonomic nervous systemPart of the nervous system that is not under conscious control and that regulates the internal organs. It includes the sympathetic, parasympathetic, and enteric nervous systems. The first, which connects the internal organs to the brain via spinal nerves, responds to stress by increasing heart rate and blood flow to the muscles and decreasing blood flow to the skin. The second comprises the cranial nerves and the lower spinal nerves, which increase digestive secretions and slow the heartbeat. Both have sensory fibres that send feedback on the condition of internal organs to the central nervous system, information that helps maintain homeostasis. The third division, embedded in the walls of the stomach and intestines, controls digestive movement and secretions. |
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| This inhibition leads to an accumulation of acetylcholine (ACh) at synapses, causing overstimulation and subsequent disruption of transmission of impulses in the central, peripheral, and autonomic nervous systems (Martin-Rubi et al. Our bodies have autonomic nervous systems whose functions are automatic. It is often called a "lie detector," since its main use is based on the idea that prevaricators will be nervous and the corresponding changes in their autonomic nervous systems will be detected. |
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