You breathe in the oxygen from your nose and mouth and when you breathe out,it's carbon dioxide.
the respiratory system
Oxygen is not the problem, the issue is body
The corneas of your eyes. All of your body parts get oxygen from the blood, including most of the eyes. The only exceptions are hair, nails, and the exposed part of the teeth.
When your blood cells go to your lungs to get oxygen, they also release carbon to make room for the oxygen, then when you breath out, the carbon gets into the air.
It comes from the fluid around your cells, which gets it from your tiny capillary blood vessels, which gets it from your arteries, which gets it from your lungs, which gets oxygen from the air you breath, which gets it from plants and reactions of materials on earth with the sun's powerful emissions which strike the earth.
it gets it oxygen from little holes on the body
Your body needs oxygen, which is picked up by the blood from the air in your lungs and then pumped around your body by the heart. If you need more oxygen (by working harder) then your heart has to pump faster.
Oxygen gets from the air to the cells of the fetus through the umbilical cord. The oxygen circulates in the mothers red blood cells.
the air in his body
Oxygen rich air enters the body through the lungs.
plants give off oxygen and so do animals and that's how it gets in the air
Animals get their oxygen from ambient air, the air around us. Depending on the animal and whether it's carnivorous, omnivorous or herbivorous would determine where exactly it gets it's food from.