Which phrase describes the function of a buffer?

To excrete weak acids.

To secrete hydrogen ions.

To convert strong acids to weak acids.

To convert ammonia to ammonium ions.

Answer and Explanation

The Correct Answer is C

Choice A rationale:

Buffers do not excrete weak acids; instead, they help regulate the pH of bodily fluids by preventing drastic changes in acidity or alkalinity.

Choice B rationale:

Buffers do not secrete hydrogen ions. In fact, buffers can either absorb or release hydrogen ions to maintain a stable pH.

Choice C rationale:

To convert strong acids to weak acids is the correct answer. Buffers are substances that can neutralize both acids and bases, helping to maintain a stable pH in a solution. They achieve this by accepting hydrogen ions from strong acids or donating hydrogen ions to strong bases, converting them into weaker acids or bases, respectively.

Choice D rationale:

Buffers do not convert ammonia to ammonium ions. This conversion is a part of the body's acid-base regulation system, but it is not the primary function of buffers.

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Correct Answer is B

Explanation

The correct answer is: B. Normocytic.

Choice A rationale: Microcytic erythrocytes, or smaller-than-normal red blood cells, are typically seen in chronic conditions like iron deficiency anemia, not acute blood loss.

Choice B rationale: Normocytic erythrocytes, or normal-sized red blood cells, are usually seen in acute blood loss as the body's initial response doesn't alter the size of red blood cells.

Choice C rationale: Hypochromic erythrocytes, or paler-than-normal red blood cells, are more common in chronic anemia states such as iron deficiency.

Choice D rationale: Megaloblastic erythrocytes, or abnormally large red blood cells, are seen in conditions like vitamin B12 or folate deficiency, not in acute blood loss.

A. 0.459% saline. B. 0.9% NaCl. C. 5% dextrose in 0.45% saline. D. Dextran.

Correct Answer is B

Explanation

Choice A rationale:

0.459% saline is a hypotonic solution with a lower concentration of salt than the normal physiological range (0.9% NaCl) Hypotonic solutions can cause red blood cells to swell and potentially burst due to the osmotic imbalance, making it inappropriate for hypovolemic shock.

Choice B rationale:

0.9% NaCl, also known as normal saline, is an isotonic solution with a salt concentration similar to the body's own fluids. Isotonic solutions are ideal for hypovolemic shock as they help to expand the intravascular volume without causing significant shifts of fluid and electrolytes within the body compartments.

Choice C rationale:

5% dextrose in 0.45% saline is a hypotonic solution with a low salt concentration. While it provides some fluid replacement, it doesn't address the electrolyte imbalance adequately, which is crucial in hypovolemic shock.

Choice D rationale:

Dextran is a plasma volume expander but is not the first-line choice for hypovolemic shock. It might be used in certain situations, but isotonic crystalloids like 0.9% NaCl are preferred for rapid volume expansion and stabilization of the patient.

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Which phrase describes the function of a buffer?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Which erythrocyte characteristic would the nurse expect to see in the laboratory findings for a patient who has experienced acute blood loss?

Correct Answer is B

Explanation

Which fluid replacement therapy would the nurse prepare to administer for a patient who is exhibiting clinical manifestations of hypovolemic shock?

Correct Answer is B

Explanation

Which manifestation is related to target organ disease from hypertension? Select all that apply.One, some, or all responses may be correct.

A patient's arterial blood gas (ABG) results include a pH of 7.32, a PaCO2 of 56 mm Hg, and an HCO3 of 24 mEq/L. Which acid-base imbalance would the nurse use when developing the patient's plan of care?

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The nurse recognizes that patients with von Willebrand disease are at risk for prolonged bleeding times for which reason?

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With which term will the nurse document the finding after noting multiple 1-mm red macules when assessing the skin of a patient with leukemia and thrombocytopenia?