Homeostasis - all thr functions of your body which try and maintain a 'constant internal environment'
Bodily levels that need to be controlled include: Ion content, water content, sugar content, temperature.
Ion content - regulated by the kidneys. Ions are taken into body in food then absorbed in blood. Some ions are lost in sweat, kidneys remove excess in urine
Water - taken into body as food and drink. Lost: through skin as sweat, via lungs in breath, via kidneys as urine. Cold day or not exercising - don't sweat much - produce more urine - urine more diluted so is pale. Hot day or exercising - sweat a lot - produce less urine - urine more concentrated so is deeper in colour - Lose more water through breath when exercising because you breathe faster
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