Oxygen is picked up by the blood when it is at the lungs.
alveoli
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.
The circulatory system is made up of heart, blood vessels, and especially the blood that delivers to the whole body and lungs by the blood vessels.
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.
The circulatory system transports oxygen from the lungs to the body's cells. Oxygen is picked up by red blood cells in the lungs and carried through blood vessels to tissues and organs where it is exchanged for carbon dioxide. This process is essential for cellular respiration and producing energy in the body.
They appear redder because they have picked up oxygen at the lungs.
Carbon dioxide is the waste product that is picked up from cells by blood. It is transported to the lungs where it is expelled from the body during exhalation.
Wastes are carried to the kidneys, the liver, and the skin. Depending on which organ can process them, the wastes are eliminated there.
Carbon dioxide is probably the most important.
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.
The blood vessels in the pulmonary circulation carry the blood through the lungs to pick up oxygen and get rid of carbon dioxide, while the blood vessels in the systemic circulation carry the blood throughout the rest of our body.
Blood flows through the walls of the lungs to release carbon dioxide and to absorb oxygen for distribution throughout the body.