which statement is false about how abdominal pain is produced? a. edema and vascular congestion produce abdominal pain by stretching. b. chemical mediators, such as histamine, bradykinin, and serotonin produce abdominal pain. c. low concentrations of anaerobes, such as streptococci, lactobacilli, staphylococci, enterobacteria, and bacteroides, produce abdominal pain. d. ischemia caused by distention of bowel obstruction or mesenteric vessel thrombosis produces abdominal pai
