The capillaries carry the blood around the alveoli.
The pulmonary artery takes the blood to the alveoli.
air exchange takes place at the juction of blood cappileries and alveoli where the pressure of air is high in alveoli and low in blood so air from alveoli rush into blood and CO2 from blood rush in to alveoli which is then breath out
Blood capillaries surrounding air sacs called alveoli.
Arteries
Veins.
as it moves through blood vessels capillaries in the alveoli walls, your blood takes oxygen from the alveoli and gives off carbon dioxide to the alveoli
In the lungs are small air sacs called alveoli. These alveoli are covered with blood capillaries. Oxygen and Carbon Dioxide diffuse through the alveolar capillary membrane. Oxygen diffuses from the alveoli to the blood capillary and carbon dioxide diffuses from the capillary to the alveoli and you breath it out of your body.
Aorta.
An artery takes blood away from the heart
Pulmonary Vein
aorta
alveoli