
Pulmonary capillaries
Pulmonary capillaries, supplied by the pulmonary artery, protrude from the interalveolar septa into alveoli, thus maximizing the surface area across which gas exchange can occur. 1000x, 4000x

Alveoli
Pulmonary capillaries, supplied by the pulmonary artery, protrude from the interalveolar septa into alveoli, thus maximizing the surface area across which gas exchange can occur. 1000x, 4000x

Interalveolar septa
Pulmonary capillaries, supplied by the pulmonary artery, protrude from the interalveolar septa into alveoli, thus maximizing the surface area across which gas exchange can occur. 1000x, 4000x

Pulmonary capillaries
Pulmonary capillaries, supplied by the pulmonary artery, protrude from the interalveolar septa into alveoli, thus maximizing the surface area across which gas exchange can occur. 1000x, 4000x

Air-blood barrier
Pulmonary capillaries, supplied by the pulmonary artery, protrude from the interalveolar septa into alveoli, thus maximizing the surface area across which gas exchange can occur. 1000x, 4000x