alveoli
Oxygen is picked up by the blood when it is at the lungs.
Oxygen is picked up in the lungs when you inhale air. The oxygen is then transported from the lungs to the rest of the body by red blood cells in the circulatory system.
They appear redder because they have picked up oxygen at the lungs.
Oxygen in the lungs attaches to red blood cells and is carried through the bloodstream to all parts of the body. The oxygen is released from the red blood cells and picked up by tissues that need it for energy production. Carbon dioxide, a waste product, is picked up by the blood and transported back to the lungs to be exhaled.
Blood flows through the walls of the lungs to release carbon dioxide and to absorb oxygen for distribution throughout the body.
If by that you mean where they get their own oxygen, then from nowhere because red blood cells do not need oxygen, they perform all reactions anaerobically.If you mean where they get it to give off for the rest of your body, then its from the lungs.
No - not really anyhow. Oxygen is brought to the lungs by breathing in air. The lungs function as an exchange system which loads up the red blood cells with oxygen. So lungs give oxygen to red blood cells which then deliver the oxygen to all the parts of the body.
The right side of the heart pumps blood to the lungs to pick up oxygen. From the lungs it goes back to the left side of the heart, which pumps it out to the rest of the body. Blood then returns to the right side of the heart and starts the cycle over.
Arterial blood is blood that has picked up oxygen (oxygenated) in the lungs and is being circulated through the body. Venous blood is blood that has been circulated and is now de-oxygenated (low Oxygen content) and is being returned to the lungs to start the process over.
Blood with no oxygen (the blood that flows to the heart picks up oxygen from the lungs).
Blood picks up oxygen from the lungs.
The lungs are responsible for picking up oxygen from the air we breathe. Oxygen diffuses across the thin walls of the lung's air sacs (alveoli) into the surrounding blood vessels, where it binds to hemoglobin in red blood cells for transport to tissues throughout the body.