what is the function of the enzyme lactase in the digestive system
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HESI LPN

HESI PN Exit Exam 2024 Quizlet

1. What is the function of the enzyme lactase in the digestive system?

Correct answer: A

Rationale: The correct answer is A: 'Breaks down lactose into glucose and galactose.' Lactase is an enzyme in the small intestine that specifically breaks down lactose, the sugar found in milk, into glucose and galactose for absorption. Choice B is incorrect because proteins are broken down into amino acids by protease enzymes. Choice C is incorrect because the enzyme amylase converts starch into maltose. Choice D is incorrect as lipase enzymes break down fats into fatty acids.

2. Which of the following is the best method for confirming nasogastric tube placement?

Correct answer: B

Rationale: Checking the pH of the aspirate is the most reliable method to confirm nasogastric tube placement as it provides direct evidence of the tube's location in the stomach. When the pH is acidic (pH < 5), it indicates that the tube is correctly placed in the stomach. Auscultating over the stomach while injecting air may not always be accurate, as the sound can be misleading due to various factors. Observing the patient’s response during feeding is not a definitive method for confirming tube placement, as it can be influenced by other factors. Measuring the external length of the tube does not ensure correct placement within the GI tract and can be affected by external factors like patient anatomy.

3. A client tells the PN that she has a family history of cancer and has increased the amount of dairy products in her diet to reduce her risk of getting cancer. How should the PN respond?

Correct answer: D

Rationale: Increasing fruits and vegetables in the diet is more beneficial in reducing cancer risk due to their high levels of antioxidants and fiber, which help protect against cancer. While exercise is important for overall health, in this context, focusing on fruits and vegetables is more relevant to reducing cancer risk than exercise alone. Providing information about cancer warning signs is not directly addressing the client's dietary choice. While Vitamin D is essential for various health aspects, the primary focus here should be on a diet rich in fruits and vegetables for cancer risk reduction.

4. At the first dressing change, the PN tells the client that her mastectomy incision is healing well, but the client refuses to look at the incision and refuses to talk about it. Which response by the PN to the client's silence is best?

Correct answer: B

Rationale: Acknowledging the client's feelings and providing emotional support without pressuring them to look at the incision is important. Choice B is the best response as it respects the client's emotional readiness to confront their body image changes. The client's autonomy and emotional needs are prioritized in this response. Choice A may invalidate the client's feelings by assuming the incision is not as bad as they think, potentially dismissing their emotions. Choice C is insensitive as it imposes a particular view of recovery on the client, disregarding their current emotional state. Choice D may escalate the situation by suggesting the need for another nurse, which could make the client feel uncomfortable and pressured.

5. A female Native American client who is receiving chemotherapy places a native artifact, an Indian medicine wheel, in her hospital room. The HCP removes the medicine wheel and tells the client, 'This type of thing does not belong in the hospital.' Which intervention should the PN implement?

Correct answer: B

Rationale: Acting as the client's advocate is the most appropriate intervention in this situation. Removing a culturally significant artifact without considering the client's beliefs and emotional needs can be distressing. By advocating for the client, the PN can ensure that the client's cultural practices are respected, which is crucial for her emotional and spiritual well-being during treatment. Choice A is incorrect because while chemotherapy adherence is important, it is not the most immediate concern in this scenario. The client's cultural needs and well-being take precedence. Choice C is incorrect because consulting with a Native American healer might not be necessary at this point and could delay addressing the immediate issue of advocating for the client's rights. Choice D is incorrect because simply reporting the client's feelings of culture shock to the HCP does not actively address the situation or advocate for the client's rights and cultural needs.

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