| 释义 |
slow-reacting substance (SRS) slow-re·act·ing sub·stance (SRS) , slow-reacting substance of anaphylaxis (SRS-A) (slō-rē-ak'ting sub'stăns, an'ă-fi-lak'sis) A leukotriene of low molecular weight released in anaphylactic shock that produces slower and more prolonged contraction of muscle than does histamine; it is active in the presence of antihistamines (but not epinephrine) and seems not to occur preformed in mast cells, but as a result of an antigen-antibody reaction on the granules. |