How is the amount of urine produced regulated in our body?

Question

Accepted Answer

## Model Answer The amount of urine produced is regulated by the process of **selective reabsorption** in the kidney tubules. The amount of water reabsorbed depends on: - How much excess water is present in the body. - How much dissolved waste needs to be excreted. If excess water is available, less is reabsorbed and more urine is produced, and vice versa. *Source: Chapter 5, Section 5.5.1* --- ## Explanation Examiners expect two key points: (1) the mechanism — selective reabsorption of water in kidney tubules, and (2) the two factors that control it — excess water in the body and amount of dissolved waste. Avoid writing about nephron structure in detail; this question is specifically about **regulation**, not production. Mentioning both factors earns full marks.

Science — AI-generated practice question