Digestive System

5. The __________ is a small area near the esophageal opening.
6. ________ mainly consists of calcium salts and is the hardest substance in the body
8. Tiny, fingerlike projection that extends from the inner lining of the small intestinal into the lumen
11. A ________ has two types of secretory cells - serous cells and mucous cells.
15. The products of the mucous cells, chief cells, and parietal cells together form ________.
17. Chemical process that breaks fatty acids down to form acetyl coenzyme A, which can enter the citric acid cycle
18. Role of peritoneal membrane that attaches abdominal organs to the posterior abdominal wall
19. The _________, which balloons superior to the cardia, is a temporary storage area.
20. Removing amino groups (-NH2) from amino acids
21. Digestive secretions of the pancreas

1. Nutrients that human cells cannot synthesize, such as certain amino acids, are called ___________.
2. Any of the glands in the stomach lining that secretes gastric juice
3. Amino acids required for health that body cells cannot synthesize in adequate amounts must be obtained in the diet.
4. Provides the acid environment needed for the production and action of pepsin
7. Substance that gastric glands produce that promotes intestinal absorption of vitamin B12
9. The __________ is the distal portion of the stomach where it approaches the small intestine.
10. The _________ canal is a narrowing of the pylorus as it approaches the small intestine. At the end of the _______ canal the muscular wall thickens, forming a powerful circular muscle, the _______ sphincter. This muscle is a valve that controls gastric emptying.
12. Tubular gland at the base of villus in the intestinal wall
13. Cellular structure that stores inactive forms of protein-splitting enzymes in a pancreatic cell
14. Lymphatic capillary associated with a villus of the small intestine
16. Fatty acid required for health that body cells cannot synthesize in adequate amounts must be obtained in the diet