How does the blood get oxygen?

Answer 1

by suking it

Answer 2

The veins lead the de-oxygenated blood back to the heart, where it goes through the right atrium, right ventricle, and through the Pulmonary Arteries to the lungs, where gas exchange happens.

Gas exchange is the process of CO2 and O2 swapping. This occurs in the capillaries, filled with blood and CO2, and the alveoli in the lungs. The capillaries wrap around the alveoli, and both capillaries and alveoli have very thin walls (one cell thick), so thin that CO2 and O2 particles can swap around.

When you breathe in, O2 travels into your lungs, through many tubes, to get to the tiny alveoli, where they then move through the alveoli's walls to the capillaries. When you breathe out, the opposite occurs, CO2 is transfered from the capillaries to the alveoli and leaves the lungs, and the body.

The capillaries then take the blood, now filled with oxygen, back to the heart. Then the blood circulates the body. This process is repeated every time you breathe.

Answer 3

Blood cells from the heart flow to the lungs, gather oxygen, and go to "share" the oxygen with the rest of the body.

Answer 4

Blood carried through veins is has no oxygen in it. Veins lead to the lungs and the air we breathe in gets into our veins (of course the carbon is removed leaving only oxygen or O2).