Unit 7 Review

In this unit we covered the skeletal system. At first glance, the skeletal system seems to just be dead bones, but it also includes the various structures that support the bones. The Bones are constantly being remodeled by the osteoclasts and osteoblasts. The osteoblasts build up the bone and the osteoclasts destroy the old bone tissue.
The skeletal system can have problems in the curvature of the spine. When this curve is lateral it is called scoliosis. Kyphosis is when the cervical vertebrae are too humped over. Lordosis it too much lumbar arch. Vitamin D is closely linked to calcium and building strong bones. Rickets is when the bones are too weak due to a vitamin D deficiency leading to too little calcium. Osteoporosis is when the when the bones become too porous. This can come with age and a dysfunction of the osteoblasts and osteoclasts in bone remodeling.

Long bone anatomy 

Joints are classified by the materials making up the joint and the movement of the joint. A fibrous joint is made of sutures or ligaments. The cartilaginous joint is made of cartilage. The synovial joints are always diarthrosis. They have a bursar that cushions the joint. These are the joints that we think of as joints, like the elbow, knee or shoulder. Classification by the movement is the synarthritic joints, without movement, the amphiarthrotic joints, with some movement, and diarthrotic, with free range.

Joint anatomy 

When a bone is fractured it first forms a blood clot. it then must rebuild the damaged tissue. It does this by sending osteoblasts to rebuild the bone. They begin to lay down new bone and soon a callus forms. Eventually, the fracture site is bridged. With bone remodeling, the scar is remade and becomes less prominent.  

I have kept up with the notes this unit. In 20 time I learned that I can be proud of something even if I did not enjoy the process. There still can be elements of pride involved.