Skeletal System Essay

Skeletal System Essay-63
Some creatures do not have internal skeletons and instead they have external shells (or exoskeletons) with muscle attachments on the interior.

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This is why dietary calcium and vitamin D are so important.The origin is the anchor, the bone that remains immobile while the muscle works.The insertion is the bone that moves as the muscle works, which is one of the main functions of the skeleton.At birth and in early childhood, all bone marrow is red.As the person ages, about half of the body’s marrow turns to yellow marrow – which is composed of fat cells.So, for example, in the case of the biceps, the upper arm and shoulder are the origins (anchor) and the bones of the forearm are the insertion.Interestingly, the amount of power the muscle needs is directly related to the length of the bone (or lever) and where it is attached.The bones of the skull are actually several flat plates joined together by sutures.These sutures allow the skull to pass through the birth canal and expand as the brain continues growing.The sutures fuse together in early childhood, forming the classic shape of the skull.The vertebrae are all irregularly shaped bones in the human body that provide both protection and flexibility for movement.


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