The respiratory system changes over time when your really working hard. Your lung capacity changes over time, because if you do more endurance work your lung needs to deliver loads of energy to your muscles, so over time it will take in loads of oxygen at once than taking it several times.
Your breathing rate will decrease , because your heart will become more efficient over time. It will pump loads of blood at once, than pumping less blood, but loads of times.
Your inter-coastal muscles will become stronger and it will allow your rip cage to expand when your breathing, so that you can take a big breath.
The diaphragm will get stronger and bigger, so that you can take bigger breath than usual.
Your capillaries gets bigger and that allows it to take significant amount of oxygen to your muscles.
There will be an Increase of efficiency to deliver oxygen and remove waste products, because your lungs will be use to working really fast.
Increased lung efficiency and gaseous exchange, because the of the intense aerobic endurance exercises.
Increased maximum oxygen uptake (V02 max). Increased Vital capacity (VC) - due to improved lung function (Vital capacity is the amount of air that can be forcibly expelled from the lungs after breathing in as deeply as possible).
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