Osteoblasts produce bone. Bone marrow is where they begin. They are cells that work together to build up the bone. These cells have only one nucleus. Osteoclasts have two or more nuclei. The new bone has the name osteoid. These cells control the amount of calcium and other minerals that enter the bone. Scientists see them in new bone, under magnification.
Old osteoblasts line the surface of a new bone. These are important in controlling how much calcium enters the bone. They also block calcium if the bone does not need it. They help in the continual growth of the bone. They are extremely necessary for strong, healthy bones.
The aging process slows the growth of osteoblasts. Older people have bone troubles as a result of this. Increased calcium is necessary for the functioning of these bone cells. These bone-lining cells signal the osteoblasts and the osteoclasts to divide and thus create more bone.
Osteocytes are osteoblasts that cannot divide or move around. The bone material called matrix catches and holds it. The osteocytes then call together other osteocytes and grow longer. These other cells carry away wastes. Also, they move nutrients where the bone needs them the most.
The cells form the femur and other long bones in the body. Ten percent of a person's bone mass gets a makeover annually. The osteoblasts also harbor collagen.
Bone mass continues growing until people reach their early 20s. Aerobic exercise helps to grow the bone. Walking, running, and weight-bearing exercises especially help bone mass to grow. The more bone mass a person has, the less likely he will get osteoporosis as he ages.
Osteoclasts and osteoblasts work together to build up bones. Osteoclasts break down and remove the dead osteoids. These two types of cells help each other to create bones that are healthy and strong.
Osteoblasts are very important in bone grafting and osteoporosis. In bone grafting, the osteoblasts must work to help the bone to graft into the other bone. Osteoblasts do an excellent job of this if the patient is healthy.
In older patients, not so many osteoblasts are present. The bone reabsorbs calcium causing it to become porous. Bones become brittle and break more easily.
Sometimes bone cells go crazy. They divide and divide and cause tumors. These cells take up the space needed for the healthy cells. Some of them are cancerous and some are not.