Which is not a requirement for effective perfusion?

A. Cyanosis is a common feature in both chronic bronchitis and emphysema due to hypoxemia, but it is more often seen in chronic bronchitis due to the persistent airway obstruction and reduced gas exchange.

B. Dyspnea (shortness of breath) is more commonly associated with emphysema due to the destruction of alveolar walls and loss of lung elasticity, which impairs gas exchange. Chronic bronchitis can also cause dyspnea, but it is more closely linked with emphysema.

C. Lymphadenopathy is not a characteristic feature of chronic bronchitis or emphysema; it is more associated with infections or malignancies.

D. Chronic bronchitis is characterized by a persistent cough with sputum production, which is a hallmark symptom. This is more prominent in chronic bronchitis than in emphysema, where the cough is less frequent and sputum production is less significant.

A. This option is incorrect because impaired sodium excretion by the kidneys does contribute to increased peripheral vascular resistance and hypertension.

B. Impaired sodium excretion by the kidneys can lead to fluid retention, which increases blood volume. This results in increased peripheral vascular resistance, a key factor in the development of hypertension.

C. Overstimulation of the parasympathetic nervous system typically causes a reduction in heart rate and vasodilation, which would generally lower blood pressure, not contribute to hypertension.

D. The renin-angiotensin-aldosterone system plays a crucial role in regulating blood pressure. Reduced secretion of renin, angiotensin, and aldosterone would not contribute to increased peripheral vascular resistance. In fact, these systems typically work to raise blood pressure when needed.