Final answer:
The appendix is attached to the cecum, which is the first part of the large intestine and assists in water and electrolyte absorption while forming feces.
Step-by-step explanation:
The large intestine is a crucial component of the human digestive system. It is chiefly responsible for the absorption of water and electrolytes as well as the formation of feces. The large intestine consists of several distinct parts including the cecum, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, and anus. A small, coiled tubular structure known as the appendix (or vermiform appendix) is attached to the cecum. The appendix has a vestigial function in humans but it contains lymphoid tissue that may play an immunological role within the gut. Specifically, the cecum is the first part of the large intestine and is the section to which the appendix is attached.