Delayed prolonged bleeding is caused by -: (A) Histamine, (B) Leukocyte dependent injury, (C) IL-1, (D) Direct injury to endothelial cells
Answer is D. Ans. is `d' i.e., Direct injury to endothelial cellso Delayed prolonged leakage is caused either by the direct effect of injurious agent or by cytokine mediated endothelial retraction.