Nephron BOW

Nephrons are the basic structure of kidneys. The bowman's capsule is a cup shape that has a double membrane surrounding the glomerulus. It's function is to filer our bodily fluids. Such as wastes, sodium, and water. To do so, blood is taken into the bowman's capsule and is passed to the glomerulus and out through the efferent arteriole. The waste is passed out into the promixal convoluted tubule. The glomerulus is the main filter. It is a mass of tubes and is semipremeable. Allowing fluids to pass through such as blood. It is then returned to the medullary plexus and into the intraloblular vein. Hydroastatic skeletons are surrounded by muscles, they are found in cold blooded organisms and also animals that have fluid filled cavity known as the coelom.

http://www.ivy-rose.co.uk/HumanBody/Urinary/Urinary_System_Nephron_Diagram.php