Now, inside the spongy bone, which is not dense, by the way, so that means it's relatively light and flexible. Inside the spongy bone, we have a specialized region known as the red bone marrow. And the red bone marrow is where we basically produce our red blood cells as well as our white blood cells. And the process by which we produce these blood cells is known as hematopoasis. So hematopoasis takes place in the red bone marrow of our spongy bone inside the epithesis of our bone. Now let's move on to our metaphosis.