Skeletal System Essay

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The skeletal system is made up of bones, cartilages, tendons and ligaments. These makes up about 20% of the total body mass. The skeleton , protection (the skull protects the brain and the rib cage supports organs such as heart and lungs), movement, mineral homeostasis (the bones store minerals such as calcium, phosphorus and magnesium), energy storage (the bone serves as an important chemical reserve and stores fats in the yellow marrow of the shaft of long bones) and haematopoiesis (all blood cells are formed in the red bone marrow of certain bones ). The muscles of the skeleton use the bones as levers for body movements and its parts. . Bones are classified according to their shapes in terms of long, short, flat and irregular bones. Subcategories such as sesamoid and wormian bones are also used to classify bones. The human adult consists of 206 bones while an infant has over 231bones. This is so because babies skeletal system consists of mainly cartilage between bones and they are not fused together to form individual bones until adulthood. Bones need various minerals in order for it to maintain its structure. Through mineral homeostasis in bones, they are able to get their chemical components such as calcium, phosphorus and magnesium. Calcium is needed for bone strength and rigidity. The typical structure of a long bone consists of epiphyses, diaphysis, epiphyseal line, periosteum, endosteum and articular cartilage. Bones are formed through ossification which includes intramembranous and endochondral occification. The skeleton is divided into two parts: the axial and the appendicular limb, the pelvic girdle and the lower limb. Bone calcification is the process by which calcium is deposited into the bone

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