Oxygen, but most of the oxygen you take in will probably get breathed out again, depending on wether or not you are exercising, and how hard you are exercising.
it's not much of an elaboration, if that's what you were going for, but I tried.
oxygen because that what you beathe in and you beathe bad air called "carbon dioide"
oxygen
Blood cells exchange carbon dioxide for oxygen. Neither is actually "air", as such.
Blood cells exchange carbon dioxide for oxygen. Neither is actually "air", as such.
Blood cells exchange carbon dioxide for oxygen. Neither is actually "air", as such.
Air, lungs, blood, cells, and cellular respirationair, lungs, bloods, cells, cellular respiration
Its in alveoli of lungs
The red blood cells pick up oxygen from the air that is inhaled into the lungs. When the red cells pick up the oxygen from the air, they expel carbon dioxide into the lungs to be exhaled.
The air sacs send oxygen to the cells.
Air, lungs, blood, cells, and cellular respirationair, lungs, bloods, cells, cellular respiration
The red blood cells pick it up from the air and take it through the blood stream to the cells in the body.
Air, lungs, blood, cells, and cellular respirationair, lungs, bloods, cells, cellular respiration
Air, lungs, blood, cells, and cellular respirationair, lungs, bloods, cells, cellular respiration
Air, lungs, blood, cells, and cellular respirationair, lungs, bloods, cells, cellular respiration