A look at the remodeling process of the bone in an organism

bone cells

Normal bone growth requires vitamins D, C, and A, plus minerals such as calcium, phosphorous, and magnesium. Osteons in compact bone tissue are aligned in the same direction along lines of stress, helping the bone resist bending or fracturing. They are aligned parallel to the long axis of the bone.

The answer lies in the properties of a third category of bone cells: the osteogenic cell.

Bone resorption

Spongy bone tissue does not contain osteons that constitute compact bone tissue. Now, drill a hole and stick the toothpick into the wall to hang up the picture. Examples of irregular bones are the vertebrae, hip bones, and several skull bones. Thus, the zone of calcified matrix connects the epiphyseal plate to the diaphysis. This process is called intermembranous ossification. This replacement of cartilage by bone is known as endochondral ossification. Compact bone is added to create bone tissue that is similar to the original, unbroken bone. These minerals, released from bones into the blood, help regulate calcium concentrations in body fluids. For example, the bone in the head of the femur may be fully replaced every six months, whereas the bone along the shaft is altered much more slowly. After this bone is set, a callus will knit the two ends together. Lengthening of Long Bones The epiphyseal plate is the area of growth in a long bone. Soon after the osteoid is laid down, inorganic salts are deposited in it to form the hardened material recognized as mineralized bone. Responding to complex developmental signals, the matrix begins to calcify. At the same time, osteoblasts via intramembranous ossification, produce new bone tissue beneath the periosteum.

Intramembranous Ossification Intramembranous ossification is the process of bone development from fibrous membranes. The older bone at the bottom of the zone of ossification is called the secondary spongiosa.

bone remodeling timeline

How do the results observed in this experiment correspond to diseases that destroy bone tissue? Osteons in compact bone tissue are aligned in the same direction along lines of stress and help the bone resist bending or fracturing. As the secreted matrix surrounding the osteoblast calcifies, the osteoblast becomes trapped within it.

Bone remodeling cycle time

For example, the bone in the head of the femur may be fully replaced every six months, whereas the bone along the shaft is altered much more slowly. During this process, cartilage cells stop dividing and all of the cartilage is replaced by bone. Bone may also be resorbed for remodeling, if the applied stresses have changed. This process is called modeling. The small dark ovals in the osteon represent the living osteocytes. A fractured or broken bone undergoes repair through four stages: Hematoma formation: Blood vessels in the broken bone tear and hemorrhage, resulting in the formation of clotted blood, or a hematoma, at the site of the break. In long bones, chondrocytes form a template of the hyaline cartilage diaphysis.

Appositional growth is the process by which old bone that lines the medullary cavity is reabsorbed and new bone tissue is grown beneath the periosteum, increasing bone diameter.

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Bone formation