Labels:apparel | book | bulletin board | case | hakham | person | silver screen | sky | windowpane OCR: W HAT HAPPENS HEN Y OU EXER CISE? HEN YOU START to exercise your body increases the supply of oxygen and energy to your muscles. It does this in two ways HEART your lungs work harder taking in more oxygen which transt ferred tc your bloodstream; and your heart beats faster pumping more oxygen- LUNGS rich blood to your muscles. Here the oxygen helps to release the extra energy needed by your m uscles. Run MUSCLES FXERCISING THE LUNGS When you breathe in oxygen passes from your lungs into your bloods stream During exercise, your lungs receive extra oxygen in two ways: the Volume ofAir Breathed In num ber of breaths you take rises up to four times; and the volume by up to SiX times. The changes in air air taken in with each breath increases volume be seen on the graph above muscies transferre ...
