Question detail
How do kidneys help maintain water and ion balance in the body?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Hormonal coordination in humans
Question
- A. By filtering blood and reabsorbing useful substances
- B. By producing hormones
- C. By increasing heart rate
- D. By storing excess water
Answer
The correct option is By filtering blood and reabsorbing useful substances. This answer is correct because it matches the approved learning objective to explain why water and ion levels must be controlled to prevent too much water entering or leaving body cells by osmosis in the subtopic Maintaining water and nitrogen balance in the body (biology only).
Explanation
The correct option is By filtering blood and reabsorbing useful substances. By filtering blood and reabsorbing useful substances is correct because it directly supports the approved learning objective to explain why water and ion levels must be controlled to prevent too much water entering or leaving body cells by osmosis. This belongs to the subtopic Maintaining water and nitrogen balance in the body (biology only) within Hormonal coordination in humans, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Maintaining water and nitrogen balance in the body (biology only).
Common mistake
Misunderstanding Osmosis
Students often confuse osmosis with diffusion, thinking they are the same process.
Remember that osmosis specifically refers to the movement of water across a semi-permeable membrane, while diffusion involves the movement of solutes. Focus on how water levels must be balanced to prevent cells from swelling or shrinking.
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