1-2 ml of venous blood

pulmonary arterial blood as it has moce CO2 than venous

The influx of carbon dioxide in venous blood.

The venous system is responsible for returning deoxygenated blood from the tissues back to the heart. It transports this blood through a network of veins, which have valves to prevent the backflow of blood. The venous system also plays a role in regulating blood volume and pressure in the body.

interesting fact when blood is in your veins it is blue but when you get a shot oxygen hit you blood and it turns red.