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Skeletal System

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laurence basco

on 27 April 2010

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Transcript of Skeletal System

Functions Of The Skeletal System 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 body's internal organs, reducing risk of injury to them.
For example, cranial bones protect the brain, vertebrae protect the spinal cord, 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 (Ca) and phosphorus (P). When required, bone releases minerals into the blood - facilitating the balance of minerals in the body. Storage of Chemical Energy:
With increasing age some bone marrow changes from 'red bone marrow' to 'yellow bone marrow'.
Yellow bone marrow consists mainly of adipose cells, and a few blood cells. It is an important chemical energy reserve.
Types Of Bones Long bones:
"Long bones" have greater length than width and consist of a shaft and a variable number of endings .
They are usually somewhat curved for strength.Examples include femur, tibia, fibula, humerus, ulna and radius. Short bones:
"Short bones" are roughly cube-shaped and have approximately equal length and width. Flat bones:
"Flat bones" have a thin shape/structure and provide considerable mechanical protection and extensive surfaces for muscle attachments. Irregular bones:
"Irregular bones" have complicated shapes. Their shapes are due to the functions they fulfill within the body, providing major mechanical support for the body yet also protecting the spinal cord. Sesamoid bones:
"Sesamoid bones" develop in some tendons in locations where there is considerable friction, tension, and physical stress. They may therefore form in the palms of the hands and the soles of the feet, however their presence and quantity varies considerably from person to person. Sutural bones:
"Sutural bones" are very small bones located within the sutural joints between the cranial bones. The number of sutural bones varies considerably from person to person. Reference





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