Collections of lymphoid tissue (MALT) that guard mucosal surfaces include all of the following except a. appendix follicles, b. the tonsils, c. Peyer's patches, d. the thymus.

Video transcript

Hi, everyone. Welcome back. Our question. Next question says the mucosa associated lymphoid tissue, MA L T consists of various components dedicated to protecting mucosal surfaces. Among the listed options, which structure is considered part of MA L T A, thymus B, tonsils, C spleen or D pancreas. Well, when we think about this, ma L T, we know protects mucosal surfaces. It's kind of the first line of defense when pathogens enter through mucosal surfaces on the body. And it's usually small aggregations of lymphocytes on mucosal surfaces. But there are a few larger aggregations forming these structures that our question asks about. And these structures include the tonsils, the P patches in the small intestine and the appendix attached to the C C of the large intestine. So when we look at our answer choices, we see that choice. B is the tonsils which are part of the MA L T. Let's look at our other answer. Choices. We know they're not one of these three structures listed, but we'll just touch on them briefly. Choice. A, the thymus is where T cells mature uh but it's not on the mucosal surface. So part of the lymphoid system but not what we're talking about. When we go to choice C the spleen, let's cross out choice. A, the spleen is also part of the lymphoid system. It's a separate lymphoid organ. So, not a collection of cells on a mucosal surface. It's involved in filtering blood and in immune response as pretty much everything in the limp attic system is and then finally choice, the pancreas, it's an organ and a gland, not part of the lymphatic system, it produces digestive enzymes and then hormones that help control blood sugar or that help regulate blood sugar, I should say but not what we're looking for. So we'll cross that out. So again, which structure is part of this ma L T that is an aggregation of lymphocytes that helped protect mucosal services. And that is choice B the tonsils. See you in the next video.