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The glomerulus is the blood filter, and the capillary walls of the glomerulus form the filter membrane. When circulating blood passes through the glomerular capillaries, water and small molecular solutes in the plasma, including a small amount of plasma proteins with small molecular weights, can filter into the cystic cavity of the renal sacs to form filtrate. Micropuncture experiments have proved that the filtrate in the glomerular is ultrafiltrate in the plasma.