Before exploring the processes that occur in the small intestine, you must be able to use the vocabulary of the small intestine effectively. Match the correct term with the sentence that describes the structure of the small intestine. 1. The three structural features of the small intestine that increase its surface area are the , the villi, and the microvilli.
2. The finger-like projections that cover the circular folds of the small intestine and contribute to the increased surface area of the small intestine are called .
3. The absorptive cells that line the wall of the intestine are called .
4. The hair-like projections that cover the surface of an enterocyte and contribute to the increased surface area of the small intestine are called .
5. The collective term for the carpet of microvilli that covers the enterocytes of the small intestine is the .
6. Each villus contains a lymphatic vessel called a that absorbs fat-soluble nutrients into the lymph fluid.
7. The tiny blood vessels located in each villus that absorb water-soluble nutrients into the bloodstream are .
8. The first section of small intestine, receiving chyme from the stomach, is called the .
9. The middle portion of the small intestine is called the .
10. The last portion, or segment, of the small intestine is called the .

a. brush border
b. villi
c. jejunum
d. enterocytes
e ileum
f. ileocecal valve
g. capillaries
h. circular folds
i. microvilli
j. pyloric sphincter
k. duodenum
l. lacteal