Pretty sure it's the first one, because that's around the number of calories recommended every day.
Muscle movement's quickest and most potent generator of energy. Anaerobic metabolism is exemplified by the phosphagen system. It generates ATP from creatine phosphate (adenosine triphosphate, the chemical which provides energy for all body processes).
B the deliverance of oxygen rich blood to muscles by the heart lungs and vascular system .. i believe
