Pulmonary hypertension results from which alteration?
A) Narrowed pulmonary capillaries
B) Narrowed bronchi and bronchioles
C) Destruction of alveoli
D) Ischemia of the myocardium

Question

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Pulmonary hypertension is caused by a narrowing of the pulmonary capillaries, leading to increased resistance to blood flow and increased pressure within the pulmonary circulation. This can result from a variety of underlying conditions, such as chronic obstructive pulmonary disease, interstitial lung disease, or pulmonary embolism. Narrowing of the bronchi and bronchioles (choice B) can contribute to obstructive lung diseases, but would not directly cause pulmonary hypertension. Destruction of the alveoli (choice C) can lead to emphysema, but again would not directly cause pulmonary hypertension. Ischemia of the myocardium (choice D) refers to reduced blood flow to the heart muscle and can lead to heart failure, but would not cause pulmonary hypertension.

Pulmonary Hypertension Results from Which Alteration