Which of the following best describes the role of osmoreceptors in the regulation of water balance in the body?

Osmoreceptors in the pituitary gland regulate the secretion of cortisol in response to changes in plasma osmolality.

Osmoreceptors in the hypothalamus detect high plasma osmolality and stimulate the release of antidiuretic hormone (ADH), which enhances water reabsorption in the kidneys.

Osmoreceptors in the kidneys monitor blood pressure changes and regulate aldosterone secretion to control sodium reabsorption and water balance.

Osmoreceptors in the hypothalamus detect low plasma osmolality and inhibit the release of antidiuretic hormone (ADH), leading to increased urine production.

Answer and Explanation

The Correct Answer is B

A. Osmoreceptors in the pituitary gland regulate the secretion of cortisol in response to changes in plasma osmolality: This is incorrect as the pituitary gland itself does not have osmoreceptors; rather, the hypothalamus contains osmoreceptors.

B. Osmoreceptors in the hypothalamus detect high plasma osmolality and stimulate the release of antidiuretic hormone (ADH), which enhances water reabsorption in the kidneys: This is correct. Osmoreceptors in the hypothalamus sense changes in plasma osmolality and regulate ADH release to maintain water balance.

C. Osmoreceptors in the kidneys monitor blood pressure changes and regulate aldosterone secretion to control sodium reabsorption and water balance: This is not correct because the kidneys primarily use juxtaglomerular cells to sense blood pressure changes and regulate aldosterone, not osmoreceptors.

D. Osmoreceptors in the hypothalamus detect low plasma osmolality and inhibit the release of antidiuretic hormone (ADH), leading to increased urine production: This is partially correct; osmoreceptors do detect low osmolality, but their inhibition of ADH would decrease urine production, not increase it.

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Correct Answer is ["C","D"]

Explanation

A. Blood urea nitrogen (BUN) 25 mg/dl (10 to 20 mg/dL): Elevated BUN can indicate dehydration or kidney issues, but it is not directly related to metabolic alkalosis.

B. Serum potassium level 4.8 mg/dL (3.5 to 5 mg/dL): This potassium level is within the normal range and does not indicate a cause of metabolic alkalosis. Metabolic alkalosis is more commonly associated with hypokalemia rather than normal potassium levels.

C. History of vomiting: Vomiting can lead to metabolic alkalosis due to the loss of stomach acid (hydrochloric acid), which reduces the body's acidity and raises the pH.

D. Overuse of antacids: Excessive use of antacids can contribute to metabolic alkalosis because antacids neutralize stomach acid, leading to an increase in blood pH.

E. Polycythemia: Polycythemia, an increased concentration of red blood cells, is not typically associated with metabolic alkalosis. It is related to other conditions such as chronic hypoxia or bone marrow disorders.

A. Respiratory acidosis B. Respiratory alkalosis C. Metabolic acidosis D. Metabolic alkalosis

Correct Answer is A

Explanation

A. Respiratory acidosis: COPD often results in impaired gas exchange and decreased removal of carbon dioxide, leading to its accumulation in the blood. This results in respiratory acidosis, characterized by elevated PaCO2 and a decreased pH.

B. Respiratory alkalosis: This condition is generally associated with hyperventilation, where excessive loss of carbon dioxide leads to a higher blood pH. It is less common in COPD, where hypoventilation is more typical.

C. Metabolic acidosis: While COPD can sometimes lead to metabolic acidosis, it is not the primary condition associated with the disease. Metabolic acidosis usually results from conditions affecting the kidneys or metabolic processes.

D. Metabolic alkalosis: This is characterized by an increased blood pH due to a loss of acid or an excess of bicarbonate. It is not typically associated with COPD.

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Which of the following best describes the role of osmoreceptors in the regulation of water balance in the body?

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Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who has metabolic alkalosis. Which of the following assessment findings is a possible cause for this condition? (Select all that apply.)

Correct Answer is ["C","D"]

Explanation

A nurse is assisting with the care of a client who has chronic obstructive pulmonary disease (COPD) and is short of breath. When reviewing the client's arterial blood gases (ABGs), which of the following conditions should the nurse anticipate the client to be experiencing?

Correct Answer is A

Explanation

Exhibits What is the most appropriate initial management for this patient?

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