Labels:book | bulletin board | case | hakham | person | sky OCR: EXERCISING THE BODY HEN YOU EXERCISE, for example. when you start to run, your body increases its supplies of energy and oxygen to your muscles. HEORT Muscles need the extra energy tc contract more pow rerfully, pulling on the bones Extra oxy gen Is required to release energy from the sugars in LUNGS food. Your lungs work harder. taking Walk in more oxygen and your heart pumps more blood. which carries the oxygen Run and pody to all parts of your body MUSCLES EXERCISING THE LUNGS When you breathe in, oxygen passes from your lungs into your blood Istream. During exerc: ise, your lungs receive extra oxygen in two ways. First the number Volume of Air Breathed of times you breathe in each minute rises by up to four times Second, the volume of up to SIX times. The changes in air volume air take ...
