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Which force motivates filtration in the kidneys?

A blood pressure

The force of blood pressure motivates filtration in the kidneys. Filtration is the process through which the kidneys remove waste products from the body. All of the water in the blood passes through the kidneys every 45 minutes. Waste products are diverted into ducts and excreted from the body, while the healthy components of the water in blood are reabsorbed into the bloodstream. Peristalsis is the set of involuntary muscle movements that move food through the digestive system.