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| What is the primary function of the small intestine? | Nutrient digestion and absorption (most nutrient absorption occurs in the jejunum; bile salts & B12 in the ileum). |
| What are the three parts of the small intestine? | Duodenum, jejunum, ileum. |
| What organ produces bile and what is its function? | The liver; bile emulsifies fats for absorption. |
| Where is bile stored and concentrated? | In the gallbladder. |
| What are the main functions of the stomach? | Mechanical and chemical digestion, secreting acid and enzymes, and beginning protein digestion via pepsin. |
| What is the role of the pancreas in digestion? | Produces digestive enzymes (lipase, amylase, proteases) and bicarbonate to neutralize gastric acid. |
| What are the major parts of the large intestine? | Cecum, ascending colon, transverse colon, descending colon, sigmoid colon, rectum. |
| What is the main function of the large intestine? | Absorption of water and electrolytes, formation and storage of feces. |
| What is the sphincter between the stomach and duodenum called, and what does it do? | The pyloric sphincter; regulates emptying of gastric contents into the duodenum. |
| What structures increase surface area in the small intestine? | Plicae circulares, villi, and microvilli. |