Patients Suffering from Tuberculosis Cough Blood, Too

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The amount of hemoptysis ranges from streaks in sputum 痰 to massive bleeding (causing death).

The color of the blood is also bright red, coming from bronchial artery 支气管动脉.

The lung receives two blood sources:
(a) venous blood from pulmonary artery 肺动脉 (to be oxidized in a lung), and
(b) arterial blood from bronchial artery.

The former is not enough to supply oxygen or nutrients to a lung.  

Lesions 病灶 in tuberculosis erode branches of bronchial arteries,resulting in hemoptysis.

In massive blood loss, angiography of a bronchial artery is done to locate the source, and release emboli to seal the leaky branch of said artery.