Nokea
Which of the following cells in the stomach secrete pepsinogen?
- A. parietal cells
- B. chief cells
- C. mucous neck cells
- D. enteroendocrine cells
Correct Answer: B
Rationale: The correct answer is B: chief cells. Chief cells are responsible for secreting pepsinogen in the stomach. Pepsinogen is an inactive form of pepsin, which is an enzyme that helps in protein digestion. Parietal cells secrete hydrochloric acid, not pepsinogen. Mucous neck cells secrete mucus to protect the stomach lining. Enteroendocrine cells secrete hormones like gastrin, but not pepsinogen. Therefore, the correct answer is B as chief cells are the specific cells that secrete pepsinogen in the stomach.
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Proteins are digested or broken down by the _____ in the stomach.
- A. pepsinogen
- B. pepsin
- C. hydrochloric acid
- D. lipase
Correct Answer: B
Rationale: The correct answer is B: pepsin. Pepsin is an enzyme secreted by the stomach that breaks down proteins into peptides. Initially, pepsin is produced in an inactive form called pepsinogen, which is activated by the acidic environment in the stomach. Pepsin works optimally at a low pH, which is maintained by hydrochloric acid (choice C) in the stomach. Lipase (choice D) is an enzyme that breaks down fats, not proteins. So, the correct enzyme responsible for digesting proteins in the stomach is pepsin.
Which hormone stimulates the release of digestive enzymes from the pancreas?
- A. Insulin
- B. Glucagon
- C. Secretin
- D. Cholecystokinin (CCK)
Correct Answer: D
Rationale: The correct answer is D, Cholecystokinin (CCK). CCK is produced in the small intestine in response to the presence of fats and proteins. It stimulates the release of digestive enzymes from the pancreas to aid in digestion. Insulin (A) and Glucagon (B) are involved in regulating blood sugar levels, not digestive enzyme release. Secretin (C) primarily stimulates the release of bicarbonate from the pancreas to neutralize stomach acid, not digestive enzymes.
Priority Decision: The nurse admitting a patient for bariatric surgery obtains the following information from the patient. Which finding should be brought to the surgeon's attention before proceeding with further patient preparation?
- A. History of hypertension
- B. History of untreated depression
- C. History of multiple attempts at weight loss
- D. History of sleep apnea treated with continuous positive airway pressure (CPAP)
Correct Answer: B
Rationale: The correct answer is B: History of untreated depression. Before proceeding with further patient preparation for bariatric surgery, it is crucial to address untreated depression as it can significantly impact the patient's mental and emotional well-being post-operatively. Untreated depression can lead to poor compliance with post-operative instructions, medication management issues, and potentially increase the risk of complications. It is essential to involve the surgeon to assess the patient's psychological readiness for surgery and ensure appropriate support and resources are in place.
Incorrect choices:
A: History of hypertension - While hypertension should be managed pre-operatively, it is not a critical factor that would require immediate attention before further preparation.
C: History of multiple attempts at weight loss - This is a common issue in patients undergoing bariatric surgery and does not pose an immediate risk that needs urgent attention.
D: History of sleep apnea treated with CPAP - While sleep apnea is a relevant consideration for bariatric surgery, the fact that it is being treated with
Which of the following is not readily absorbed in the small intestine?
- A. Na+
- B. Cl-
- C. K+
- D. Mg++
Correct Answer: D
Rationale: The correct answer is D, Mg++. Magnesium is not readily absorbed in the small intestine due to its reliance on active transport mechanisms and limited absorption sites. Na+, Cl-, and K+ are all readily absorbed in the small intestine through passive or active transport processes. Na+ is mainly absorbed through active transport, Cl- through passive diffusion, and K+ through both passive and active transport mechanisms. Therefore, Mg++ stands out as it requires specific carriers for absorption, making it less readily absorbed compared to the other ions.
The patient asks why the serologic test of HBV DNA quantitation is being done. What is the best rationale for the nurse to explain the test to the patient?
- A. Indicates ongoing infection with HBV
- B. Indicates co-infection with HBV and HDV
- C. Indicates previous infection or immunization to HBV
- D. Indicates viral replication and effectiveness of therapy for chronic HBV
Correct Answer: D
Rationale: The correct answer is D because HBV DNA quantitation measures the amount of HBV genetic material in the blood, reflecting viral replication. This helps monitor the effectiveness of therapy in chronic HBV patients. Choice A is incorrect as the test does not specifically indicate ongoing infection. Choice B is incorrect as it refers to co-infection with HDV, which is not the purpose of HBV DNA quantitation. Choice C is incorrect as the test does not differentiate between previous infection and ongoing viral replication, which is crucial in managing chronic HBV.