Question

Why do humans have an appendix even though it is unnecessary?? Give me Correct Answer​

Answer 1

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In humans, the appendix is a small, dead-end tube that connects to the colon near where the small intestines feeds into the large intestines. Being a dead-end tube, the appendix can obviously not transport food and waste through the intestinal tract. But the appendix turns out to not be completely useless.

Answer 2

Answer:

The human cecal appendix is not completely unnecessary. In humans, the appendix is a small, dead-end tube that connects to the colon near where the small intestines feeds into the large intestines. Being a dead-end tube, the appendix can obviously not transport food and waste through the intestinal tract. Furthermore, many people have had their appendix removed and yet seem to suffer no symptoms at all from having no appendix. This fact may seem to indicate that the appendix is useless; an abandoned evolutionary relict of some ancient predecessor. But the appendix turns out to not be completely useless.

digestive system

Public Domain Image, source: NIH.

According to a study performed by a team lead by J. H. Grendell of Winthrop University Hospital, people without an appendix were found to experience recurring intestinal C. diff. infections 2.5 times as much as people with an intact appendix. They state, "The CDI recurrence rate for patients with an appendix was 18%, compared with 45% in those without an appendix." Additionally, the tissue of the appendix has been found to be rich in active lymphatic follicles similar to those found throughout the intestinal tract. Such lymphatic tissue plays several important biochemical roles in the immune system. In fact, the immune tissue of the appendix has a higher density of immunoglobulin (Ig)A- and IgG-producing immunocytes than the colon. The appendix therefore appears to play a role in the gut's defense against infection.

While the details are not yet fully confirmed