Long-distance runners often describe hitting the wall' towards the end of a race as their bodies run out of quick, usable energy. This causes extreme exhaustion as the body switches over to its stored energy reserves. Which macromolecules are these runners
mostly using at the beginning and end of each race?
A)
Beginning protein: End: lipids
B)
Beginning: lipids, End: protein
Beginning: lipids: End: carbohydrates
D
Beginning: carbohydrates: End: lipids