Nokea
Which of these is involved in the chemical digestion of protein?
- A. pancreatic amylase
- B. trypsin
- C. sucrase
- D. pancreatic nuclease
Correct Answer: B
Rationale: The correct answer is B: trypsin. Trypsin is an enzyme produced by the pancreas that specifically breaks down proteins into smaller peptides. It works in the small intestine to continue the process of protein digestion. Pancreatic amylase (A) breaks down carbohydrates, sucrase (C) breaks down sucrose, and pancreatic nuclease (D) breaks down nucleic acids, not proteins. Therefore, trypsin is the only enzyme involved in the chemical digestion of protein among the choices provided.
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Submucosal glands occur in the submucosa of the and they also occur in the _.
- A. Oesophagus and ileum
- B. Stomach and Duodenum
- C. Stomach and ileum
- D. Oesophagus and Duodenum
Correct Answer: B
Rationale: The correct answer is B: Stomach and Duodenum. Submucosal glands are found in the submucosa of the stomach and duodenum. In the stomach, these glands secrete mucus and bicarbonate to protect the lining from stomach acid. In the duodenum, they secrete mucus to protect the lining from the acidic chyme entering from the stomach. Choices A, C, and D are incorrect because submucosal glands are not typically found in the oesophagus or ileum. The rationale for the correct answer is based on the anatomical location and function of submucosal glands in the gastrointestinal tract.
Which organ has the most metabolically active cells?
- A. pancreas
- B. liver
- C. stomach
- D. small intestine
Correct Answer: B
Rationale: The correct answer is B: liver. The liver has the most metabolically active cells due to its crucial role in various metabolic processes, such as detoxification, protein synthesis, and glucose metabolism. It is responsible for producing enzymes and metabolizing nutrients. The pancreas, stomach, and small intestine are important organs, but they are not as metabolically active as the liver. The pancreas primarily produces digestive enzymes and regulates blood sugar levels. The stomach digests food, and the small intestine absorbs nutrients. However, in terms of overall metabolic activity, the liver surpasses these organs.
Once chylomicrons leave the simple columnar epithelium of the small intestine, they diffuse into
- A. capillaries.
- B. lacteals.
- C. arterioles.
- D. venules.
Correct Answer: B
Rationale: The correct answer is B: lacteals. Chylomicrons are too large to enter capillaries directly, so they are absorbed into lacteals, specialized lymphatic vessels in the small intestine. Lacteals transport chylomicrons to the lymphatic system, eventually reaching the bloodstream via the thoracic duct. Arterioles and venules are part of the blood circulation system and are not directly involved in chylomicron absorption.
A nurse is providing teaching for a client who has a new diagnosis of gastroesophageal reflux disease (GERD). The client asks about foods he should avoid eating. Which of the following foods should the nurse tell him to avoid?
- A. Nonfat milk
- B. Chocolate
- C. Apples
- D. Oatmeal
Correct Answer: B
Rationale: The correct answer is B: Chocolate. Chocolate is high in fat and caffeine, which can relax the lower esophageal sphincter, leading to increased acid reflux in GERD. Nonfat milk (A), apples (C), and oatmeal (D) are actually recommended for GERD as they are low in fat and acidic content, and can help reduce symptoms.
The colonic mucosal cells are very efficient in:
- A. Converting primary bile acids into secondary bile acids
- B. Converting bilirubin into stercobilinogen
- C. Absorption of aromatic amino acids
- D. Absorption of sodium
Correct Answer: D
Rationale: The correct answer is D: Absorption of sodium. Colonic mucosal cells are efficient in absorbing sodium through active transport processes. Sodium absorption helps in maintaining fluid and electrolyte balance. Choices A, B, and C are incorrect because primary bile acids are converted into secondary bile acids in the liver, bilirubin is converted into stercobilinogen in the intestines, and aromatic amino acids are mostly absorbed in the small intestine, not the colon.