As Blood flows into Just about every nephron, it enters a cluster of small blood vessels—the glomerulus. The skinny walls with the glomerulus let scaled-down molecules, wastes, and fluid—typically water—to go in to the tubule. More substantial molecules, such as proteins and blood cells, stay in the blood vessel. Sympathetic https://iwsite.blob.core.windows.net/mediacontainer/iwsite/media/THE-URINARY-SYSTEM.pdf