Furthermore, long bones contain both hemopoietic (red) and stromal (yellow) marrow which produce red blood cells and fat cells respectively. Bones also function to protect internal organs, assist body movements, and the storage and release of ions such as calcium and phosphorous. Bones function to protect internal organs, assist body movements, store and release calcium and phosphorous, participate in blood cell production and store fat in the yellow marrow. Without the foundational structure of the skeletal system, there would be nothing to support the body and provide points of attachment for muscles. Whereas the appendicular skeleton consists of the clavicle, scapula and the rest of the upper and lower limbs. The axial skeleton consists of the skull, hyoid bone, vertebral column, sternum, and ribs. It is divided into the axial and the appendicular skeleton. It is made mostly of collagen, which gives bone its soft framework, and calcium phosphate which adds strength and hardness to the structure. Osteoclast, meanwhile, are large multinucleated cells responsible for the dissolution and reabsorption of bone. Osteoblast are responsible for secreting the bony matrix necessary for bone formation. Bones, like other organ systems, have specialized cells which allow them to perform a variety of essential tasks. Many people think of the skeletal system as being static in that it is unchanging, however, this is not the case. The skeletal system is the primary structural organ system of the body.
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