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 B

Explanation

A. Bradypnea, or abnormally slow breathing, is not typically associated with hypoxia. Hypoxia usually triggers an increase in respiratory rate (tachypnea) as the body attempts to take in more oxygen to meet its needs.
B. Cyanosis, a bluish discoloration of the skin and mucous membranes, is a key sign of hypoxia. It occurs when there is insufficient oxygen in the blood, leading to a darker color of deoxygenated hemoglobin. Cyanosis is most commonly observed in the lips, fingertips, and toes.
C. Pallor, or paleness of the skin, can occur in various conditions but is not specific to hypoxia. It is more commonly associated with anemia or shock rather than low oxygen levels in the blood.
D. Bradycardia, or a slower-than-normal heart rate, is not typically a manifestation of hypoxia. Instead, hypoxia often causes tachycardia as the body attempts to increase oxygen delivery to tissues by pumping blood more quickly.

A. Dyspnea B. Chronic cough C. Wheezing D. Sputum production E. Chest tightness

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

Explanation

A. Dyspnea: Shortness of breath is a common and significant symptom of COPD, resulting from the narrowing of airways and difficulty in expelling air.

B. Chronic cough: A persistent cough, often productive, is a hallmark of COPD. It is typically a response to chronic irritation and inflammation of the airways.

C. Wheezing: Wheezing is a common symptom of COPD due to the constriction of airways and turbulent airflow through narrowed airways.

D. Sputum production: Increased sputum production is common in COPD, especially in chronic bronchitis type of COPD, where inflammation leads to excess mucus production.

E. Chest tightness: While chest tightness can occur in COPD, it is less commonly emphasized compared to the other symptoms listed. The primary symptoms are generally more focused on dyspnea, cough, wheezing, and sputum production.

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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

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