The nephron (from Greek Î½ÎµÏÏÏÏ - nephros, meaning kidney) is the basic structural and functional unit of the kidney. Its chief function is to regulate the concentration of water and soluble substances like sodium salts by filtering the blood, reabsorbing what is needed and excreting the rest as urine. nephron eliminates wastes from the body, regulates blood volume and blood pressure, controls levels of electrolytes and metabolites, and regulates blood pH.
Most people use a Leg Curl Machine at the gym to work out their hamstrings, but all you need are some ankle weights or a set of resistance bands. Wrap the weights or bands around your ankles, and, keeping your upper leg immobile, bend your knees and try to touch your butt with your heels.
This is NOT an easy exercise, but it's amazing for your hamstrings. It's like doing a Superman or Back Hyperextension, but using your hamstrings to do the work instead of your back. You'll need someone to hold your feet as you use your hamstrings to lower your body to the floor and pull back up.