carbon dioxide
The blood passes through tiny capillaries that lie in close proximity to the alveoli in the lungs. This is where the gas exchange takes place.
Oxygen is the gas that passes from the lungs to the bloodstream.
Oxygen
Oxygen in the lungs and passes through the alveoli, small sacs which allow gas exchange, and enters the blood to be pumped throughout the body.
blood takes oxygen and gives carbon dioxide to the lungs
oxigen is the gas that enters the blood through the lungs
it goes to the lungs
It turns red
ravioli
Blood picks up oxygen in the lungs when it passes through the alveoli, tiny air sacs where gas exchange occurs. Oxygen from the air we breathe enters the blood in the lungs and is then carried throughout the body by red blood cells.
oxygen
oxigen is the gas that enters the blood through the lungs