2. What causes the difference in amounts of bleeding?

The respiratory tract has two sources of blood supply. The lungs receive blood from the pulmonary arteries which are under lower pressure. The bronchi receive blood from the bronchial arteries.

These are under normal pressure. Therefore, bleeding from the bronchial arteries gives massive bleeding. On the contrary, when your lungs bleed, it contains blood in abundance. It is so because of the low pressure.


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