If you train your body by doing loads of aerobic endurance, eventually all of your cadiovascular system wil become efficient.
Your breathing rate decreases at a resting point, your breathing becomes more efficient. You'll start taking less oxygen when your exercising, because your heart got bigger and stronger and increase of stroke volume, that means it will be more efficient on pumping blood around your body. pumping more blood in one beat than it used to with two pumps. The beats become more efficient , because the high intensity of exercise you've been doing over that period of time causes the wall of the left Ventricle to become thicker allowing a lot more blood leave the heart, so it doesn't have to pump has much. lowering your resting heart rate by even two beats a minute means your heart beats 2,880 less in just one day.
Your blood vessels will be able to handle significant amount of pressure, because of the training you've put them through over a long period of time. The number of Capillaries increases due to the regular exercise you've been doing, so your body becomes more efficient on taking waste products out, such as like carbon dioxide.
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