Yes and no. Yes - there exists dynamic equilibrium. No - it is not as simple as the equation you wrote.
Hmm, so lets say this complicated dynamic equilibrium, would Le Chatelier's Principle still apply? During plasma calcium homeostasis, many things occur and one of them is the increase reabsoption of calcium and excretion of phosphate in the kidneys. I was wondering what the mechanism of excreting phosphate would be. My two guesses would be that since calcium and phosphate tend to precipitate, there will be more free calcium or that due to Le Chatelier's Principle, bone will resorb more to release more phosphate ions and calciums ions as well?
something is missing
Opps, a silly mistake, I missed the sub 4.