The cells of the adaptive immune system are special types of leukocytes, called lymphocytes. B cells and T cells are the major types of lymphocytes and are derived from hematopoietic stem cells in the bone marrow.
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In fact, vomiting is not a typical symptom of lower gastrointestinal bleeding. In addition to intense pain and vomiting, other signs and symptoms of gastric ulcers include loss. of appetite, unexplained weight loss, heartburn, indigestion, belching, bloating and nausea.Left. untreated, peptic ulcers can result in anemia from loss of blood, infection (peritonitis) from tissue.n addition to intense pain and vomiting, other signs and symptoms of gastric ulcers include loss. of appetite, unexplained weight loss, heartburn, indigestion, belching, bloating and nausea.