Bones are living tissues composed of several distinct layers and components that provide both strength and flexibility. Johns Hopkins Medicine Periosteum
Your body needs calcium to contract muscles and fire nerves. If your diet lacks calcium for the day, your body doesn't panic—it goes to the bank. Your bones release calcium into the bloodstream to keep you alive. This is a double-edged sword: if you withdraw too much and never deposit, your bones become brittle. Bones are living tissues composed of several distinct
Following closely behind are the osteoblasts, the builders. They fill these pits with new collagen fibers and minerals, hardening the bone and restoring its integrity. This constant cycle of destruction and reconstruction allows bones to adapt to stress. If you take up running, your bones will remodel to become stronger in the specific areas where the impact is felt. Conversely, in zero-gravity environments like space, where bones bear no weight, the osteoclasts outpace the osteoblasts, leading to rapid bone density loss. Your bones release calcium into the bloodstream to