Final answer:
When the blood plasma moves from the glomerulus into the glomerular capsule, it becomes known as filtrate. This stage is essential in the process of filtering the blood in the kidneys to form urine.
Step-by-step explanation:
When blood plasma moves out of the glomerulus and into the glomerular capsule, it is now called filtrate. This is the filtration stage of nephron function in the kidneys. The glomerular capsule, also known as Bowman's capsule, collects the filtrate which includes water, salts, organic solids such as nutrients, and metabolic wastes like urea. As blood pressure forces some of the water and dissolved substances in the blood to cross the capillary walls, these substances pass into Bowman's capsule and continue through the nephron, where they will eventually form urine after undergoing processes like reabsorption and secretion.