Describe the kidneys as organs that remove excess water, ions and urea from the blood in urine.

In the subtopic Maintaining water and nitrogen balance in the body (biology only), this learning objective focuses on describe the kidneys as organs that remove excess water, ions and urea from the blood in urine. 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 kidneys, urea, and urine. kidneys means organs that filter blood to remove excess water, ions, and urea, producing urine. Avoid students often describe the kidneys only as filters without mentioning their role in removing excess water, ions, and urea; instead emphasize that the kidneys not only filter blood but also specifically remove excess water, ions, and urea to produce urine. For exam answers, focus on describing how kidneys filter blood and produce urine, emphasizing the removal of excess water, ions, and urea.