A. False Vascular obstruction tends to increase pulmonary vascular resistance and cause pulmonary hypertension.
B. True Due to the fall in pulmonary blood flow, atrial pressure tends to fall.
C. False The obstruction tends to dam back blood in the right heart.
D. False It rises since pulmonary capillary perfusion falls.
E. False Blood that traverses pulmonary capillaries is adequately oxygenated; cyanosis in patients with pulmonary embolism is usually peripheral cyanosis due to low cardiac output.
