each is true of calcium within saliva except one which is the exception

ATI RN

ATI Nutrition Proctored Exam

1. Each statement is true of calcium within saliva, except one. Which is the exception?

A. Saliva is supersaturated with calcium.
B. Saliva is a source of calcium to mineralize an immature or demineralized enamel surface.
C. Calcium and phosphate in saliva provide a buffering action.
D. Calcium within saliva increases dental caries.

Correct answer: D

Rationale: The correct answer is D. Calcium within saliva does not increase dental caries; in fact, the buffering action provided by calcium and phosphate in saliva inhibits caries formation by preventing the dissolution of enamel by plaque biofilm. Choice A is correct as saliva is indeed supersaturated with calcium. Choice B is correct as saliva serves as a source of calcium to mineralize an immature or demineralized enamel surface. Choice C is correct as calcium and phosphate in saliva do provide a buffering action to protect teeth from acids.

2. Causes of acute renal failure include:

A. chronic renal failure
B. uncontrolled diabetes mellitus
C. recurrent urinary tract infections
D. severe injury such as extensive burns

Correct answer: D

Rationale: The correct answer is D. Severe injuries, like extensive burns, can cause acute renal failure due to shock, reduced blood flow to the kidneys, and tissue damage. Choices A, B, and C are incorrect because chronic renal failure, uncontrolled diabetes mellitus, and recurrent urinary tract infections are more likely to contribute to chronic kidney disease rather than acute renal failure.

3. Among people who are ill, significant weight loss may be masked by?

A. dehydration
B. a large tumor
C. drug therapy
D. fluid retention

Correct answer: D

Rationale: Fluid retention can mask weight loss in ill individuals as the retained fluid adds to body weight, making it difficult to detect true fat or muscle loss. Dehydration (Choice A) would actually lead to weight loss rather than masking it. While a large tumor (Choice B) could contribute to weight loss, it would not mask the weight loss itself. Drug therapy (Choice C) may cause side effects, including weight changes, but it is unlikely to mask significant weight loss in the same way that fluid retention does.

4. A client is being instructed by a nurse about foods that should be included in a low-fiber diet. Which statement by the client indicates understanding?

A. I can cut up carrots and celery sticks for my lunch.
B. I will eat a bran muffin for my mid-morning snack.
C. I will have oatmeal with skim milk for my breakfast.
D. I should choose canned peaches for my fruit serving.

Correct answer: D

Rationale: The correct answer is D because canned peaches are lower in fiber compared to the other options. Carrots, celery sticks, bran muffins, and oatmeal are high-fiber choices, which are not suitable for a low-fiber diet. Choosing canned peaches aligns with the requirements of a low-fiber diet.

5. When taking a blood pressure reading, where should the cuff be positioned?

A. The cuff should be deflated fully before immediately starting a second reading for the same patient
B. The cuff should be deflated quickly after being inflated to 180 mmHg
C. The cuff should be large enough to wrap around the upper arm of the adult patient, positioned 1 cm above the brachial artery
D. The cuff should be inflated to 30 mmHg above the estimated systolic BP based on palpation of the radial or brachial artery

Correct answer: D

Rationale: When measuring blood pressure, the cuff should be inflated to 30 mmHg above the estimated systolic blood pressure based on palpation of the radial or brachial artery. This ensures an accurate blood pressure measurement. Choices A, B, and C are incorrect. Deflating the cuff fully before starting a second reading (Choice A) does not directly relate to the position of the cuff during a reading. Deflating the cuff quickly after inflating to 180 mmHg (Choice B) is not recommended because it can potentially lead to inaccurate readings. While ensuring the cuff is large enough to wrap around the upper arm positioned 1 cm above the brachial artery is important (Choice C), this alone does not guarantee an accurate blood pressure reading. The correct inflation based on palpation is the key element for accuracy, which is why Choice D is correct.