
Pulmonary capillaries
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. 1000x

Lumen of alveolar duct
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. 1000x

Alveolar lumens
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. 1000x

Pulmonary capillaries >
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. Red arrows indicate a capillary cut in longitudinal section. 1000x

Interalveolar septum
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. 1000x

Air-blood barrier
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. 1000x

Endothelial cell nuclei
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. 1000x

Type I cell
Deoxygenated blood from the pulmonary arteries supplies the pulmonary capillaries in the interalveolar septa. The walls of these capillaries form a portion of the air-blood barrier, across which oxygen and carbon dioxide are transported. Pulmonary capillaries drain into pulmonary veins. 1000x