So the collagen gives the bone tensile strength, but it's the hydroxy appetite of the extracellular matrix that gives the bone compressive strength. So now let's discuss the different types of cells found inside our bone. So we have osteoblasts, we have osteocides, and we also have osteoclasts. So let's begin with the osteoblasts. So the osteoblasts are basically those cells inside the bone that are responsible for building that bone, for building and secreting the extracellular matrix. So that means these osteoblasts are capable of secreting collagen into our extracellular matrix.