🦊 In this GCSE Biology video, we explain how Antidiuretic Hormone (ADH), produced by the pituitary gland, regulates the body's water content by controlling urine concentration. ADH acts on the kidneys to adjust water reabsorption based on the body's hydration levels, ensuring balance through a process of negative feedback. When the body is dehydrated, ADH increases water reabsorption, leading to less water loss in urine. Conversely, when hydration levels are adequate, ADH secretion decreases, allowing more water to be excreted. This regulation helps maintain optimal water levels in the blood, contrasting with diuretics like alcohol and coffee that increase urine production and can lead to dehydration.

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