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.
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 D
Explanation
A. Oral antibiotics: Antibiotics are not indicated for allergic rhinitis, as it is an allergic condition rather than an infection.
B. Oral decongestants: While decongestants can provide temporary relief from nasal congestion, they can also cause rebound congestion if used for prolonged periods.
C. Nasal saline irrigation: Nasal saline irrigation can help to clear out mucus and allergens but is not a primary treatment for allergic rhinitis.
D. Intranasal corticosteroids: Intranasal corticosteroids are the most effective treatment for allergic rhinitis, as they reduce inflammation in the nasal passages and help to alleviate symptoms.
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.
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