Waste materials such as excess metabolic wastes, excess ions, excess water, and toxic substances need to be removed from the body of the organism as the accumulation of such materials is harmful to the organism. This process is called excretion. Urination is a mode of excretion and has three steps: filtration, reabsorption and secretion.

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Chapter 49, Problem 6TY

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Introduction: Waste materials such as excess metabolic wastes, excess ions, excess water, and toxic substances need to be removed from the body of the organism as the accumulation of such materials is harmful to the organism. This process is called excretion. Urination is a mode of excretion and has three steps: filtration, reabsorption and secretion.

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