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Bio Lab 6
| Question | Answer |
|---|---|
| How much liquid ingested and secreted within the GI tract is absorbed overall? | 9.2L |
| What structure in responsible for the absorption and how much does it absorb? | The small intestine and it absorbs 8.3L |
| Structures within the small intestines that are involved in absorption? | Circular folds, villi and microvilli |
| What nutrients are further digested at the microvilli? | Carbs, proteins and nucleotides |
| What vitamins are absorbed in the small intestine? | Vitamins ADEK, most B and Viamin C |
| What percentage of absorption occurs in the small intestine? What percentage of water absorption occurs in the small intestine? | 90%. 90% |
| What are two movements involved with mechanical digestion in the large intestine? | Churning, and peristalsis. |
| What is mass peristalsis? What initiates it? | Strong peristalsis wave that begins at the middle of the transverse colon and drives contents into the rectum. Gastrocolic reflex. |
| Which vitamins are absorbed in the colon? | Some B vitamins and Vitamin K |
| What percentage of water entering the colon is absorbed? | 80-90% |
| What reflex is initiated when feces are pushed into the rectum? | Defecation Reflex |
| What are some muscles involved with the opening of the internal anal sphincter? | Diaphragm and abdominal sphincters |
| What else needs to happen before defecation can occur? | Relaxation of external anal sphincter |
| Where does the pancreas lie? | Posterior to the stomach. |
| 99% of the pancreas cells produce... | Alkaline exocrine secretions. It neutralizes the chyme entering the small intestine. |
| Trypsin is an enzyme in the pancreas, what does it do? | It digests proteins. |
| What is the function of amylase? Lipase?(Pancreas) | Amylase digests carbs. Lipase digests lipids. |
| Where does the exocrine secretions of the pancreas empty? | Accessory pancreatic duct, pancreatic duct. These empty into the duodenum. |
| Two chemicals that are metabolized by the liver? | ammonia, medications, and alcohol |
| List 3 cells phagocytosed by the liver? | Worn out RBCs, WBCs, bacteria. |
| Two functions of bile are? | emulsification of fats and absorption of fats |
| What are two functions of the gallbladder? | Store and concentrate bile |
| What two hormones release bile into the duodenum | Secretin and cholecystokinin |
Created by:
Lillejoa
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