It produces this pre hormone known as our colicalcipheral. Now, the final function, function number seven of the skin, is basically in growth. So we know that as the human grows, as the bone grows and the organ grows, the skin must grow along with everything else inside the human body. And that means the skin must be able to expand. Now, earlier we mentioned that the skin contains protein fibers known as elastin. And it's these elastin fibers that actually give our skin its flexibility and ability to basically expand as the organism grows.