The process is called diffusion, and it requires no energy input.
Your heart pumps red blood cells to your lungs to get rid of carbon dioxide and get oxygen in exchange, so respiratory problem could limit the amount of oxygen your red bloods cells can take in or the amount of carbon dioxide they can get rid of. It will make the heart beat faster to get the blood oxygenated.
<span>mA (millamps) x Time (seconds) = mAs</span>
