Which term refers to the distal large intestine, i.e., the rectum?

• A. Pseud(o)
• B. Ptosis
• C. Py(o)
• D. Proct

Answer: (D)

In anatomy, terms that name a specific region often use a combining form built from Greek or Latin roots. The combining form proct- designates the rectum and anus, the distal portion of the large intestine. That’s why medical terms like proctology (the study of the rectum and anus) and proctitis (inflammation of the rectum) use this root. The other options don’t fit because pseud- means false, ptosis means drooping, and py- relates to pus. So proct- is the root that correctly refers to the rectum.