What is the primary function of Bowman's capsule in the kidneys?

Bowman's capsule plays a crucial role in the kidneys primarily through the filtration of blood. It is the cup-shaped structure that encases the glomerulus, a network of capillaries where blood filtration begins. The primary function of Bowman's capsule is to collect the filtrate that is produced when blood passes through the glomerulus. During this process, water, ions, and small molecules pass through the capillary walls and into the capsule, while larger molecules, such as proteins and blood cells, remain in the bloodstream. This filtrate then enters the renal tubules, where further processing occurs, including reabsorption and secretion. Understanding the filtration process in Bowman's capsule is essential for comprehending how the kidneys maintain fluid and electrolyte balance, as well as their role in waste excretion. Other functions, such as secretion of hormones or urine storage, are attributed to different structures within the kidneys or urinary system.