🦊 In this GCSE Biology video, we discuss how water levels in the body decrease through exhalation, sweating, and urination, and increase by eating and drinking. It highlights that while sweat excretes water, ions, and urea, its primary function is cooling down the body rather than regulating water levels, which is the role of the kidneys. The kidneys adjust water levels by filtering excess water, ions, and urea from the blood, crucial for maintaining cellular homeostasis. Osmotic changes due to varying water levels can cause cells to shrivel or swell, impacting their function, underscoring the importance of maintaining balanced water levels in the body.
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