Osteoclasts, cells that break down bone (also known as bone resorption) ![]() Bones are comprised of three types of cells: Your bones are also made of collagen, a protein that gives them some flexibility, allowing them to give a little without breaking. When you’re a baby, your bones are soft and flexible, and even fuse together with other bones (fun fact: you’re born with almost 100 more bones than you have as an adult).Īs you grow older, cartilage is replaced by calcium phosphate, a mineral that makes them hard. What are bones made of? At first, mostly cartilage (a resilient and smooth elastic tissue). ![]() ![]() ![]() Your bones start forming when you’re a fetus, and they continue to do so until sometime in your 20s. Let’s start at the very beginning-in utero.
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