During urine formation in the vertebrate kidney, the processes of filtration and tubular secretion are similar in that both

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Filtration and tubular secretion both involve the movement of substances from the blood into the filtrate. Filtration occurs as blood pressure forces water and solutes out of the blood and into the filtrate in the Bowman's capsule, while tubular secretion involves the active or passive transfer of substances from the blood into the tubular fluid along the nephron, allowing the body to excrete certain substances at rates higher than would occur with filtration alone.

During Urine Formation in the Vertebrate Kidney, the Processes of Filtration