Nokea
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.
You may also like to solve these questions
Which of these statements about reflexes in the GI tract is false?
- A. Short reflexes are provoked by nerves near the GI tract.
- B. Short reflexes are mediated by the enteric nervous system.
- C. Food that distends the stomach initiates long reflexes.
- D. Long reflexes can be provoked by stimuli originating outside the GI tract.
Correct Answer: C
Rationale: The correct answer is C because food that distends the stomach actually initiates short reflexes, not long reflexes. Short reflexes are provoked by nerves near the GI tract, which aligns with choice A. Short reflexes are indeed mediated by the enteric nervous system, supporting choice B. Long reflexes, as per choice D, can be provoked by stimuli originating outside the GI tract. Therefore, choice C is false as food distending the stomach triggers short reflexes, not long reflexes.
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.
Which of the following is correct regarding the cells of the gastric pit?
- A. Mucous cells are enteroendocrine
- B. G cells are exocrine
- C. D cells secrete histamine
- D. G cells secrete histamine
Correct Answer: D
Rationale: The correct answer is D because G cells in the gastric pit secrete gastrin, not histamine. Gastrin stimulates the release of hydrochloric acid in the stomach. Mucous cells are not enteroendocrine, so A is incorrect. G cells are not exocrine, making B incorrect. D cells secrete somatostatin, not histamine, so C is also incorrect.
Which method is preferred for immediate treatment of an acute episode of constipation?
- A. An enema
- B. Stool softeners
- C. Increased fluid
- D. Bulk-forming medication
Correct Answer: A
Rationale: An enema is often the preferred immediate treatment for acute constipation to relieve discomfort and promote bowel evacuation.
The defaecation reflex:
- A. Is initiated by stretching the anal canal
- B. Is integrated in a control center in the lumbar spinal cord
- C. Is integrated in a control center in the sacral spinal cord
- D. Is controlled by the vagus nerve
Correct Answer: C
Rationale: The correct answer is C because the defecation reflex is integrated in a control center in the sacral spinal cord. This is due to the presence of the parasympathetic nerves that control the smooth muscles of the colon and rectum in the sacral region. The sacral spinal cord is responsible for coordinating the reflexive relaxation of the internal anal sphincter and contraction of the rectum during defecation. Choices A and B are incorrect because the initiation and integration of the defecation reflex do not involve the anal canal stretching or the lumbar spinal cord. Choice D is incorrect as the defecation reflex is not controlled by the vagus nerve, which is primarily responsible for the parasympathetic innervation of organs in the thorax and upper abdomen.