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14 sie 2023 · There are four pulmonary veins. Pairs of two emerge from each of the hila of the lungs. The left superior pulmonary vein drains the left upper lobe and the lingula. The left inferior pulmonary vein drains the left lower lobe. The right superior pulmonary vein drains the right upper and middle lobe.
In the lungs, oxygen diffuses across alveolar walls into pulmonary capillaries. This exchange of gases between the lungs and blood is called external respiration. The exchange of gases between the blood and tissues is called internal respiration. The movement of air into and out of the lungs is known as ventilation.
15 sie 2024 · In the lungs, the smallest of blood vessels, called capillaries, are the site where carbon dioxide is removed and oxygen obtained from the alveoli, the smallest structures of the respiratory tree. From the capillaries, blood enters the bronchial veins, which then drain into the pulmonary veins.
The pulmonary venules are responsible for returning oxygenated blood from the lung tissue to the pulmonary veins, which subsequently will transport it back to the left atrium of the heart. The extensive network of capillaries surrounding the alveoli are drained by the pulmonary venules.
The organs of the respiratory system form a continuous system of passages, called the respiratory tract, through which air flows into and out of the body. The respiratory tract has two major divisions: the upper respiratory tract and the lower respiratory tract .
The respiratory system is made up of the organs included in the exchange of oxygen and carbon dioxide. The respiratory system is divided into two areas: the upper respiratory tract and the lower respiratory tract.
Upper respiratory tract organs provide a route for air to move between the outside atmosphere and the lungs. They also clean, humidity, and warm the incoming air. However, no gas exchange occurs in these organs.
