Lungs
Their respiratory surface is wet skin.Gases exchange through the skin.
An embryo receives oxygen and nutrients from the mother's bloodstream through the placenta. The exchange of gases happens through the umbilical cord, which allows oxygen to enter the embryo's bloodstream and carbon dioxide to exit, preventing suffocation.
Oxygen enters the bloodstream through the alveoli in the lungs. When you breathe, oxygen from the air diffuses across the thin walls of the alveoli into the surrounding capillaries, where it binds to hemoglobin in red blood cells for transport throughout the body.
Oxygen (O2) enters your body through breathing air, which contains oxygen in it. This oxygen goes into your lungs where it is put into the bloodstream, supplied to cells in your body, returned to the lungs as carbon dioxide (CO2), and exhaled through the lungs.
You breathe in through your nostrils or mouth, which allows air to enter your respiratory system and reach your lungs where oxygen is absorbed into the bloodstream.
Through the alveoli in your lungs.
Blood picks up oxygen and releases carbon dioxide in the lungs.
Blood picks up oxygen and releases carbon dioxide in the lungs.
Oxygen first enters your body through your respiratory system, specifically through your nose or mouth, where it is inhaled into your lungs. In the lungs, oxygen is transferred from the air you breathe into your bloodstream to be circulated throughout your body to provide energy to your cells.
No. The blood is always pumped in one direction.
The respiratory system.
Oxygen enters the body through the respiratory system. It is inhaled through the nose or mouth, travels down the trachea, enters the lungs, and then diffuses into the bloodstream through tiny blood vessels called capillaries in the lungs.