Which of the following best describes the primary physiological role of B-type natriuretic peptide (BNP) in the regulation of cardiovascular function?

BNP promotes the synthesis of angiotensin II to enhance fluid retention and increase blood pressure.

BNP increases heart rate and cardiac contractility to enhance cardiac output.

BNP increases blood pressure by causing vasoconstriction and stimulating aldosterone release.

BNP decreases blood pressure by causing vasodilation and promoting sodium and water excretion.

Answer and Explanation

The Correct Answer is D

A. BNP does not promote the synthesis of angiotensin II; instead, it counteracts the effects of the renin-angiotensin-aldosterone system (RAAS) by reducing fluid retention and blood pressure, which is the opposite of what angiotensin II does.
B. BNP does not increase heart rate or cardiac contractility. Its role is primarily in reducing cardiac workload by lowering blood pressure and decreasing fluid volume.
C. BNP does not increase blood pressure; rather, it acts to decrease it by causing vasodilation and inhibiting the effects of aldosterone, which would otherwise increase blood pressure by promoting sodium and water retention.
D. BNP decreases blood pressure by causing vasodilation and promoting the excretion of sodium and water, which reduces blood volume and, consequently, lowers the blood pressure. This is its primary role in cardiovascular regulation, especially in response to heart failure.

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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.

A. Repeating the same question over and over B. Awareness of COPD manifestations C. Anxiety and restlessness D. Motivation and engagement of the client

Correct Answer is B

Explanation

A. Repeating the same question over and over: This behavior might indicate confusion or lack of understanding but is not a typical anticipated outcome of education. Effective education should lead to better understanding rather than repeated questions.

B. Awareness of COPD manifestations: An anticipated outcome of education for a client with COPD is increased awareness of their condition and its manifestations. This knowledge helps the client manage their symptoms and recognize exacerbations early.

C. Anxiety and restlessness: While some anxiety might be present, effective education aims to reduce anxiety by providing information and strategies for managing COPD. The goal is to increase confidence and knowledge, which can help mitigate anxiety.

D. Motivation and engagement of the client: While motivation and engagement are positive outcomes, they are not the primary focus of initial educational interventions. The primary goal is to ensure that the client is aware of their condition and understands how to manage it effectively.

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Which of the following best describes the primary physiological role of B-type natriuretic peptide (BNP) in the regulation of cardiovascular function?

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