Oxygen and Carbon Dioxide Unloading
Did you know that every time you exhale, you are releasing carbon dioxide into the air which plants use to breathe so that they can releases oxygen that we can breathe? It's like one big breathing circle of life! So how does our body process oxygen and carbon dioxide?
In our bodies, body cells are continually removing oxygen from blood which leaves more oxgyen in the alveoli than in the blood. The oxygen, from the air, then travels to the oxygen poor blood of the pulmonary capillaries. Reversely, tissue cells remove oxygen from the blood and release carbon dioxide into the blood. Because the concentration of carbon dioxide is much higher in the pulmonary capillaries than in the alveolar air, it will move from the blood into the alveoli and be flushed out of lungs during expiration.
So all this just goes to say that blood draining from the lungs into the pulmonary veins, which carry blood to the heart, is oxygen-rich and carbon dioxide-poor.
In our bodies, body cells are continually removing oxygen from blood which leaves more oxgyen in the alveoli than in the blood. The oxygen, from the air, then travels to the oxygen poor blood of the pulmonary capillaries. Reversely, tissue cells remove oxygen from the blood and release carbon dioxide into the blood. Because the concentration of carbon dioxide is much higher in the pulmonary capillaries than in the alveolar air, it will move from the blood into the alveoli and be flushed out of lungs during expiration.
So all this just goes to say that blood draining from the lungs into the pulmonary veins, which carry blood to the heart, is oxygen-rich and carbon dioxide-poor.