The Juggling Act You Never Notice

Imagine you're running a marathon on a hot day. Your muscles are burning through glucose at a furious rate, your core temperature is climbing, you're losing litres of water in sweat, and your blood is being pushed to its limits. Yet somehow, inside your body, the temperature stays within a degree of 37°C, your blood glucose stays in range, your blood pH barely shifts from 7.4, and your cells keep working. Your body is simultaneously cooling itself, managing energy, fighting dehydration, and maintaining chemical balance — all without you thinking about it for a single second.