Question

CH03: The Human Body: Are We Really What We Eat? Focus Figure 3.12: Small Intestine Structure and Function ileocecal valve 1. The three structural features of the small intestine that increase ts surface area are the microvilli circular folds.the vill, and the microvilli. pyloric sphincter 2. The finger-like projections that cover the circular folds of the small intestine and contribute to the jejunum increased surface area of the small intestine are called villi 3. The absorptive cells that line the wall of the intestine are called enterocytes 4. The hair-hke projections that cover the surface of an enterocyte and contribute to the increased ileum surface area of the small intestine are called duodenum 5. The collective term for the carpet of microvilli that covers the enterocytes of the small intestine is the lacteal 6. Each villus contains a lymphatic vessel called a that absorbs fat-soluble nutrients capillaries into the lymph fluid. brush border 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 notion of the small intestine is called the

Answer 1

1. The three structural features of the small intestine that increase its surface area are the circular folds, 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 villi.

3. The absorptive cells that line the wall of the intestine are called enterocytes.

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 microvilli.

5. The collective term for the carpet of microvilli that covers the enterocytes of the small intestine is the brush border.

6. Each villus contains a lymphatic vessel called a lacteal 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 capillaries.

8. The first section of the small intestine, receiving chyme from the stomach, is called the duodenum.

9. The middle portion of the small intestine is called the jejunum.

10. The last portion, or segment, of the small intestine, is called the ileum.