Nokea
Fatty acids and glycerol are released when _____ are broken down by liver or muscle cells.
- A. micelles
- B. chylomicrons
- C. lacteals
- D. lipoproteins
Correct Answer: B
Rationale: The correct answer is B: chylomicrons. Chylomicrons are lipoprotein particles that transport dietary lipids (including fatty acids and glycerol) from the small intestine to the liver or muscle cells for metabolism. When chylomicrons reach the liver or muscles, lipoprotein lipase breaks them down, releasing fatty acids and glycerol for energy production or storage.
Now, let's analyze why the other choices are incorrect:
A: Micelles are small lipid droplets formed in the small intestine to aid in lipid digestion and absorption, but they do not release fatty acids and glycerol when broken down.
C: Lacteals are lymphatic vessels in the small intestine that absorb dietary fats, but they do not release fatty acids and glycerol.
D: Lipoproteins are involved in transporting lipids in the bloodstream but do not release fatty acids and glycerol when broken down.
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The exocrine pancreas secretes the following enzymes except:
- A. Chymotrypsinogen
- B. Prolestase
- C. Lactase
- D. Alph
Correct Answer: C
Rationale: The correct answer is C: Lactase. Lactase is an enzyme produced in the small intestine, not in the pancreas. The exocrine pancreas secretes digestive enzymes like chymotrypsinogen, proelastase, and lipase to aid in the digestion of proteins, fats, and carbohydrates. Lactase is responsible for breaking down lactose, a sugar found in dairy products, and is produced in the small intestine. Therefore, C is the correct answer. Choices A, B, and D are incorrect because chymotrypsinogen, proelastase, and alph are all enzymes produced by the pancreas to aid in digestion.
Gastric enzymes are secreted by the _____ cells.
- A. chief
- B. goblet
- C. parietal
- D. oxyntic
Correct Answer: A
Rationale: The correct answer is A: chief cells. Chief cells are responsible for secreting gastric enzymes, such as pepsinogen, in the stomach. These enzymes play a crucial role in breaking down proteins during digestion. Goblet cells (B) secrete mucus, parietal cells (C) secrete hydrochloric acid, and oxyntic cells (D) are another term for parietal cells. Therefore, the correct choice is A as chief cells specifically produce gastric enzymes.
The stomach produces acids, which denature protein, and popsin that digests protein. The cell membranes of the epithelial cells lining the stomach contain protein. The protein in the epithelial cells are not denatured or digested because
- A. the membranes contain a different type of protein that resists denaturation and digestion.
- B. mucus coats the epithelium.
- C. cell membranes are destroyed but mitotic activity replaces cells with new ones every few hours.
- D. hormones produced by the endocrine cells protect the cell membranes and neutralize the acid pH.
Correct Answer: B
Rationale: The correct answer is B: mucus coats the epithelium. The mucus layer acts as a protective barrier that prevents the acid and pepsin from coming into direct contact with the epithelial cells. This physical barrier helps to shield the cell membranes from denaturation and digestion. Choice A is incorrect because the type of protein in the cell membranes does not determine their resistance to denaturation and digestion. Choice C is incorrect because cell membranes are not destroyed, and mitotic activity does not play a role in protecting the cell membranes. Choice D is incorrect because hormones do not directly protect the cell membranes from acid and pepsin; rather, it is the mucus layer that provides the necessary protection.
The important enzymes present in Pancreatic juice are :
- A. Trypsin, Amylopsin, Steapsin
- B. Pepsin, Rennin, Gastric Lipase
- C. Erepsin, Invertase, Lipase
- D. Ptyalin, Maltase, Lactase
Correct Answer: A
Rationale: The correct answer is A because pancreatic juice contains Trypsin for protein digestion, Amylopsin for carbohydrate digestion, and Steapsin for fat digestion. Trypsin breaks down proteins into peptides, Amylopsin breaks down carbohydrates into sugars, and Steapsin breaks down fats into fatty acids and glycerol. Pepsin, Rennin, and Gastric Lipase (option B) are enzymes found in the stomach, while Erepsin, Invertase, and Lipase (option C) are enzymes found in the small intestine. Ptyalin, Maltase, and Lactase (option D) are enzymes involved in digestion but are not found in pancreatic juice.
Which single statement below, about the stomach, is actually correct?
- A. Acid secretion occurs in response to secretion of the hormone, carbonic anhydrase
- B. Glands called Peyer's patches are responsible for acid secretion
- C. The vagus nerve inhibits acid secretion after a meal has been consumed
- D. Pepsinogen and gastric lipase are two enzymes secreted into the lumen of the stomach
Correct Answer: D
Rationale: The correct answer is D because pepsinogen and gastric lipase are indeed two enzymes secreted into the lumen of the stomach. Pepsinogen is converted to pepsin, an enzyme that breaks down proteins, while gastric lipase helps in the digestion of fats.
A is incorrect because carbonic anhydrase is not a hormone but an enzyme involved in acid secretion.
B is incorrect because Peyer's patches are actually found in the small intestine, not the stomach, and they are involved in the immune system.
C is incorrect because the vagus nerve stimulates, rather than inhibits, acid secretion in response to a meal.
In summary, D is correct as it accurately describes enzymes secreted in the stomach, while the other choices contain factual inaccuracies about stomach function.