![]() This component of cardiorespiratory fitness is dependent on too many factors, both chemical and structural, to address in this article. Okay, now let's discuss the second component of cardiorespiratory fitness, namely the ability of your muscles to absorb and use oxygen once it has been delivered. Therefore, your cardiorespiratory fitness level is in part (remember, there is a second component to cardiorespiratory fitness yet to be discussed) a measure of how well your heart, arteries, veins, and lungs are able to work together to transport oxygen to your muscles according to the oxygen delivery steps listed above. Once in the lungs, your blood releases the carbon dioxide into the air that you breathe out and absorbs more oxygen from the air that you breathe in, and the entire process begins again. The de-oxygenated and carbon dioxide rich blood is pumped out of the right side of your heart to your lungs via your pulmonary artery. ![]() The now de-oxygenated and carbon dioxide rich blood is returned to the right side of your heart via your veins. At the same time that your blood is providing oxygen to your muscles, it is also removing carbon dioxide, a waste product from muscle cellular respiration, from them.
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