IMAT 2013 Q38 [Immunity]

Which one of the following is not involved in defending the body against infection?

A. Antibodies
B. T cell
C. Beta cell
D. B cell
E. Phagocyte

The answer to this question is choice C.

This is a question that asks you to find the odd-one-out, and in this case, the central theme is the immune system.

If you are to analyze, choice A, B, D, and E are parts of the immune system:

  • Antibodies: An antibody is a type of immunoglobulin, which is a protein, that is produced by plasma cells in response to an antigen, which are substances that illicit an immune response.
  • T and B cells: The cells are also called lymphocytes, and are integral parts of the immune system. You will find these cells in the blood and lymph tissues after they have been produced by the bone marrow. As a short overview, B cells are the ones tasked to make antibodies mentioned above, while T cells are tasked to eliminate cells that activated the immune system.
  • Phagocytes: The cells includes monocytes, macrophages, and neutrophils, all of which play an important role as well in the immune system. Using the process of phagocytosis along with the utilization of different enzymes, they have the ability to kill microbes, ingest foreign material that intruded the body, and even remove dead cells.

If “Beta cells” aren’t part of the immune system, where can it be found?

  • Beta cells are actually found within the pancreas. Specifically, they are found in the islets of Langerhans, which is composed of 70% beta cells. The function of Beta cells is to produce insulin, the hormone vital to the aspect of homeostasis, which is the blood glucose concentration.