- The substance diffusing into circulation from sympathetic nerve terminals when they are active. The term was introduced by W.B. Cannon, who thought that this substance differed from the mediator produced by the nerve ending (now known to be incorrect); the mediator itself (norepinephrine) diffuses into circulation. SYN: sympathetic hormone.
* * *sym·pa·thin 'sim-pə-thən n a substance (as norepinephrine) that is secreted by sympathetic nerve endings and acts as a chemical mediator
* * *n.
Medical dictionary. 2011.
Look at other dictionaries:
sympathin — n. hormonal substance secreted by the sympathetic nervous system (Physiology) … English contemporary dictionary
sympathin — sym·pa·thin … English syllables
sympathin — n. the name given by early physiologists to the substances released from sympathetic nerve endings, now known to be a mixture of adrenaline and noradrenaline … The new mediacal dictionary
sympathin — ˈsimpəthə̇n noun ( s) Etymology: International Scientific Vocabulary sympath (from sympathetic) (I) + in : a neurohormone secreted by the sympathetic nerve endings and acting as chemical mediator to the various organs … Useful english dictionary
Симпатии (Sympathin) — прежнее название веществ, высвобождаемых из симпатических нервных окончаний; в настоящее время установлено, что они представляют собой смесь адреналина и норадреналина. Источник: Медицинский словарь … Медицинские термины
СИМПАТИИ — (sympathin) прежнее название веществ, высвобождаемых из симпатических нервных окончаний; в настоящее время установлено, что они представляют собой смесь адреналина и норадреналина … Толковый словарь по медицине
Cannon, Walter B(radford) — born Oct. 19, 1871, Prairie du Chien, Wis., U.S. died Oct. 1, 1945, Franklin, N.H. U.S. neurologist and physiologist. He was the first to use X rays in physiological studies. He also investigated hemorrhagic and traumatic shock during World War I … Universalium
Cannon, Walter Bradford — ▪ American neurologist born Oct. 19, 1871, Prairie du Chien, Wis., U.S. died Oct. 1, 1945, Franklin, N.H. American neurologist and physiologist who was the first to use X rays in physiological studies. These led to his publication of The… … Universalium
Hormone — A chemical substance produced in the body that controls and regulates the activity of certain cells or organs. Many hormones are secreted by specialized glands such as the thyroid gland. Hormones are essential for every activity of daily living,… … Medical dictionary
autoassay — Detection or estimation of the amount of a substance produced in an organism by means of a test object in that organism, as, for example, use of the denervated heart in situ of a cat to assay for epinephrine or sympathin liberated into its … Medical dictionary