Answer:
Cells absorb oxygen and release CO2 via the bloodstream. Please find below detailed explanation
Step-by-step explanation:
Oxygen and carbondioxide (CO2) are the major gaseous substances involved in celluar respiration. Aerobic celluar respiration, which is the process by which cells obtain energy, requires oxygen to occur. The oxygen initially gets breathed in as a constituent of air, which later passes through air sacs and gets attached to hemoglobin in red blood cells. Hemoglobin transports oxygen throughout the cells of the body.
After the process of celluar respiration is done, carbondioxide (CO2) is released back into the bloodstream, which carries it to the lungs. The CO2 is released when we breathe out.