Final answer:
Podocytes are the large cells that are part of the glomerular capillaries, forming a critical component of the kidney's filtration system by creating a selective barrier within Bowman's capsule.
Step-by-step explanation:
The large cells that wrap around and are part of the glomerular capillaries are called podocytes. Podocytes form the visceral layer of Bowman's capsule and are essential in the kidney's filtration process. They have finger-like processes known as pedicels that interdigitate with one another to form a filtration membrane, allowing them to selectively filter substances from the blood into the glomerular filtrate.