Biology
Mineral Homeostasis
Quick fact
The human body contains about 1 kg of calcium, most in bones, but only 1% circulates in blood; yet that tiny fraction is tightly regulated because it controls muscle contraction and nerve signaling.
Why this is interesting
Your body keeps a precise balance of minerals like calcium and potassium—so precise that a tiny shift can cause muscle cramps, heart arrhythmias, or even organ failure. How does it manage this invisible balancing act?