Anatomy & Physiology › Section X · Fluid, electrolyte, and acid-base balance › Topic X.2
Water balance
You gain and lose a few litres of water every day, yet the concentration of your blood barely changes. This topic shows how thirst controls what comes in, how the kidneys, guided by antidiuretic hormone, control what goes out, and what happens when the two fall out of step.
In this topic
- In equals out
- Where water comes from and goes
- Worked example: a day's water budget
- Thirst
- Antidiuretic hormone
- Worked example: the smallest possible urine volume
- Signals about volume
- When balance fails
- Diuretics
- Common mistakes to avoid
- Key takeaways
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