Competitive athletes often "carbohydrate load" in the weeks leading up to their athletic events. The point of carbohydrate loading is to maximize the athletes' glycogen stores. What is glycogen?

actually carb loading does not  work due to the fact that your body has a set number on the ammount of carbs it can obsorb at any given time. as a competitive athlete it is not weeks in addvance its 48 hours in advance.

Explanation:

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.