Problem: There's a strong link between psoriasis and inflammatory bowel disease, or IBD. IBD includes Crohn's disease and ulcerative colitis (UC). Crohn's can affect any part of the stomach and intestines; UC usually affects the large intestine. If a psoriatic person were to develop Crohn's disease which digestive processes might be affected? What about ulcerative colitis? And what additional evidence would you need to provide a higher level of specificity in what process will be disrupted? Explain using structure and function.
Please provide an explanation that isn't too detailed. It just needs to tie into the immune system, (Terms to possibly include: small/middle intestine, macrophages, helper cells (T & B), cytokines, inflammation).
Avoid medical conjectures and please make it high-school level. (You may draw models/diagrams and use flow charts!)