Pulmonary capillaries
Pulmonary arteries supply deoxygenated blood to alveolar 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 exchanged. Oxygenated blood from alveolar capillaries drains mostly into pulmonary veins. The presence of smooth muscle knobs indicates that this alveolus is attached to an alveolar duct. 1000x
Alveolus
Pulmonary arteries supply deoxygenated blood to alveolar 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 exchanged. Oxygenated blood from alveolar capillaries drains mostly into pulmonary veins. The presence of smooth muscle knobs indicates that this alveolus is attached to an alveolar duct. 1000x
Interalveolar septa
Pulmonary arteries supply deoxygenated blood to alveolar 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 exchanged. Oxygenated blood from alveolar capillaries drains mostly into pulmonary veins. The presence of smooth muscle knobs indicates that this alveolus is attached to an alveolar duct. 1000x
- Alveolar (pulmonary) capillaries
Pulmonary arteries supply deoxygenated blood to alveolar 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 exchanged. Oxygenated blood from alveolar capillaries drains mostly into pulmonary veins. The presence of smooth muscle knobs indicates that this alveolus is attached to an alveolar duct. 1000x
- Smooth muscle knobs
Pulmonary arteries supply deoxygenated blood to alveolar 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 exchanged. Oxygenated blood from alveolar capillaries drains mostly into pulmonary veins. The presence of smooth muscle knobs indicates that this alveolus is attached to an alveolar duct. 1000x
- Type II (septal) cells
Pulmonary arteries supply deoxygenated blood to alveolar 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 exchanged. Oxygenated blood from alveolar capillaries drains mostly into pulmonary veins. The presence of smooth muscle knobs indicates that this alveolus is attached to an alveolar duct. 1000x
