We’ve all felt that urge - whether it’s after pulling on a wetsuit and getting into a cold sea, lowering yourself into your local swimming pool or just sinking into your monthly bath - why do we always have to get out again and answer nature’s call? This is called IMMERSION DIURESIS. I had always assumed it was some physical phenomenon to do with the wetness of the water or perhaps it was all psychological, but when I investigated it I found it was actually a clever demonstration of euvolaemic homeostasis, ie how the body regulates its fluid content. The circulatory system, brain, heart and kidneys continually work to ensure you stay euvolaemic (this means having just the right amount of fluid on board - hypovolaemic means too little and hypervolaemic means overloaded with fluid). If fluid levels are low, we feel thirsty and drink. But if they’re high, the kidneys make more urine so you feel the urge to pee. The body has complex methods of deciding what to do, and just one element of this system are baroreceptors which detect pressure changes in the bloodstream. When you get into water - particularly cold water - you can 'fool' these baroreceptors. Aquaman shows you how in just 1 minute. ______________ More Medlife Crisis: http://www.medlifecrisis.co.uk/ https://twitter.com/medcrisis https://www.facebook.com/Medlifecrisis https://www.instagram.com/medcrisis ----------------------- Music: Beachfront Celebration by Kevin Macleod, available at https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1200022