So, as the blood travels through the blood capillaries of the glomerulus, we basically have a layer of different cells known as our filtration membrane. So this is a three layer membrane. So these rest cells are the endothelial cells of the blood vessels that contain the tiny pores, the tiny holes that allow the movement of small molecules, such as water molecules, amino acids, glucose molecules, as well as electrolytes, such as sodium ions, potassium ions, and other things. Now, this purple section is the basement membrane that is shown in this diagram. It's this purple outline that goes all the way around our Bowman's capsule. So this purple layer is the basement membrane.