Which combining form means second part of small intestine?

• A. Kal/o
• B. Mamm/o, mast/o
• C. Gonad/o
• D. Jejun/o

Answer: (D)

Jejun/o is the combining form for the jejunum, the middle section of the small intestine. The small intestine has three parts in order: the duodenum (first), the jejunum (second), and the ileum (third). The jejunum is the main site for nutrient absorption, with its many folds and villi increasing surface area. In medical terms, attaching the combining form jejun/o to endings gives words like jejunal (pertaining to the jejunum) or jejunostomy (surgical creation of a jejunal opening). The other roots point to different structures or concepts—kal/o relates to potassium, mamm/o or mast/o to the breast, and gonad/o to the reproductive glands—so they don’t denote the second part of the small intestine.