Describe kidney function as filtration of blood followed by selective reabsorption of useful substances.

In the subtopic Maintaining water and nitrogen balance in the body (biology only), this learning objective focuses on describe kidney function as filtration of blood followed by selective reabsorption of useful substances. Within Hormonal coordination in humans, students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include selective reabsorption. kidney function means the process by which the kidneys filter blood to remove waste products and excess substances, followed by the selective reabsorption of useful substances back into the bloodstream. Avoid students often describe kidney function only as filtration without mentioning selective reabsorption; instead emphasize that kidney function involves both the filtration of blood and the selective reabsorption of useful substances, ensuring that essential nutrients are retained. For exam answers, focus on describing the process of blood filtration and the role of selective reabsorption in the kidneys during your revision.