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Support : the skeleton is the framework of the body, it supports the softer tissues and provides points of attachment for most skeletal muscles.
Protection : the skeleton provides mechanical protection for many of the bodies internal organs, reducing risk of injury to them. For example, cranial bones protect the brain, vertebrae protect the spinal chord, and the ribcage protects the heart and lungs.
Assisting in movement : skeletal muscles are attached to bones, therefore when the associated muscles contract they cause bones to move.
Storage of minerals : bone tissues store several minerals, including calcium and phosphorus. When required bone releases minerals into the blood – facilitating the balance of minerals in the body.
Production of blood cells : Bone marrow is a gelatinous material that produces white blood cells, red blood cells, or platelets.
Storage of chemical energy : With increasing age some bone marrow changes from red bone marrow to yellow bone marrow which is and important chemical energy reserve.
The axial skeleton consists of bones that form the axis of the body and support and protect the organs of the head, neck, and trunk. The axial skeleton is made up of the skull, sternum, ribs, and vertebral column.
The appendicular skeleton is composed of bones that anchor the appendages to the axial skeleton. The appendicular skeleton consists of the upper and lower extremities, and the shoulder and pelvic girdle.