When we breathe in oxygen enters the small air sacs, called alveoli, in the lungs. Oxygen diffuses from there into the bloodstream. Oxygen is not carried in the plasma, but is carried by the red blood cells. Like glucose, oxygen can diffuse into cells from the capillaries.
Correspondingly, how is oxygen transported through the body?
Hemoglobin: The protein inside red blood cells (a) that carries oxygen to cells and carbon dioxide to the lungs is hemoglobin (b). Hemoglobin is made up of four symmetrical subunits and four heme groups. Iron associated with the heme binds oxygen.
How does oxygen flow through the respiratory system?
The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.
How does your body get oxygen?
When you breathe, air enters microscopic air sacs in your lungs called alveoli. Oxygen passes through the walls of the alveoli and into the bloodstream. The blood carries oxygen to cells throughout the body, where it helps convert nutrients into usable energy.