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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Causes of Peptic Ulcers. Different factors can cause the lining of the stomach, the esophagus, and the small intestine to break down. These include: 1  Helicobacter pylori (H. pylori) - a bacteria that can cause a stomach infection and inflammation.2  frequent use of aspirin, ibuprofen, and other anti-inflammatory drugs (risk associated with this behavior is increased in women and people over the age of 60). 3  smoking. 4  drinking too much alcohol.ntreated ulcers can become worse over time and lead to other, more serious health complications, such as: 1  perforation-A hole develops in the lining of the stomach or small intestine and causes an infection. 2  Signs of a perforated ulcer include sudden, severe abdominal pain.