Vocabulary for Bones and Bone Markings on page(s) 161-162.(Red Royal Knives) Royal, BM 1-EYE-DAN 1* (One Ass To Risk) 2 Jakes Custom Knives 29 Knives 3 Dog Knife (3DK) 365 Knives 3LEGDOG Knives (Riaan Manser) 4:44PM Watches 4T5 Design 5.11 Tactical 9line Knives A.C. The shape and composition of each bone allow them to function as mentioned above. There are five classifications of bones based on their shape, long bones, short bones, flat bones, irregular bones and sesamoid bones. It is made of trabeculae which give spongy bone its characteristic lighter weight. Spongy bone, on the other hand, is typically the deepest layer of a bone’s composition. This central canal is the passage for nerves, blood vessels, and lymphatics. Osteons are composed of rings called lamellae that spiral down into a central canal, known as the Haversian canal. Compact bone is made up of circular units called osteons. It is stronger than spongy bone and provides more stability. Compact bone is typically found along the perimeter of bones and makes up the majority of the diaphysis of long bones. The two types of bone tissue are compact and spongy bone. Each of these cells have specific functions that are key to the development and repair of a bone over time. 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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