<prompt> In acute inflammation, contraction of endothelial cells results in the following:Delayed transient increase in permeabilityEarly transient increase in permeabilityDelayed permanent increase in permeabilityEarly permanent increase in permeability  <response>: Endothelial cell contraction leading to intercellular gaps in postcapillary venules is the most common cause of increased vascular permeability. Endothelial cell contraction occurs rapidly after binding of histamine, bradykinin, leukotrienes, and many other mediators to specific receptors, and is usually sho lived 15-30 min. Ref: Robbins Basic Pathology edited by Vinay Kumar, Abul K. Abbas, Jon C. Aster, 2012, Page 34. 