21. Barium sulfate, an insoluble white powder is typically used for enhancing contrast in the GI tract . 22. Food consumption inhibits its absorption from the GI tract , and the drug is more quickly eliminated. 23. These individuals have recurrent swelling in the extremities, face, lips, larynx or GI tract . 24. House explains his reasoning about the disease not reaching the GI tract and orders the test anyway. 25. It might've been the sun / diet or maybe the malaria / GI tract problems. 26. Excess dopamine can also affect digestion, producing vomiting and inhibiting motor signaling to the GI tract . 27. The following lists principal events that lead to absorption of vitamin B 12 along the GI tract : 28. Other factors in the GI tract contribution to immune function include enzymes secreted in the saliva and bile. 29. When lipase activity is blocked, triglycerides from the diet are not GI tract after an oral dose. 30. Fecaliths are hard formations of ingest that obstruct the GI tract , and may require surgery to resolve.