The size of your fist and the shape of a bean, your kidneys are your body’s filtration system. They make sure waste doesn’t build up in your blood, allowing you to function normally. Inside this curiously shaped organ are millions of tiny filtration agents, know as nephrons, which I think you’ll agree is a pretty cool name. Each nephron is in turn made up of a glomerulus and tubule. The glomerulus acts like sieve, allowing the smaller waste products and water to flow into the tubule…