While skin is the only organ directly exposed to atmospheric oxygen, it doesn't directly carry oxygen like the blood does. The skin receives its oxygen supply from the blood, which carries oxygen throughout the body.
Skin does take up oxygen from the air, but the amount is negligible compared to the oxygen taken up by the lungs. This uptake is primarily used for local metabolic processes within the skin, such as cell growth and repair.
The blood is the primary carrier of oxygen in the body. Red blood cells, which are the most abundant cells in the blood, contain hemoglobin, a protein that binds to oxygen molecules in the lungs. Hemoglobin then transports the oxygen throughout the body, delivering it to tissues and organs that need it.
In conclusion, skin does not carry oxygen, but it receives oxygen from the blood for its own metabolic processes.
