A man presents to an ER with a large laceration sustained at a construction site a few hours before. The area around the laceration is erythematous, painful, and swollen. Question 1. The erythema and swelling can be explained at a cellular level by all the following EXCEPT. a. mast cell degranulation and release of histamine. b. pro-inflammatory prostaglandins released. c. increased vasomotor tone (tightening) of the capillaries in the area. d. local reaction to acute phase reactants.