Human Body System
Skeletal  System
By: Zamaria Lewis

The major functions is the mechanical, its bones provide a framework for the attachment of muscles and other tissues movement. Bones enable body movements by acting as levers and points of attachment for muscles. The protective, which its  bones such as the skull and rib cage protect vital organs from injury. The bones also protect the marrow.  Also the Metabolic. The  bones serve as a reservoir for calcium and phosphorus, essential minerals for various cellular activities throughout the body.  The production of blood cells, or hematopoiesis, occurs in the red marrow found within the cavities of certain bones.

                            Diseases and Disorders

  • Osteoporosis: This is a disease in which the bones become fragile and prone to fracture.
  • Leukemia: This is a cancer of the white blood cells.
  • Osteopenia, osteitis deforming, and osteomalacia: Similar to osteoporosis, these are other types of bone loss.

                    How it interacts with other body parts

     Bones provide calcium that is essential for the proper            functioning of the nervous system. The skull protects the brain for injury. The vertebrae protects the spinal cord from injury. Sensory receptors in joints between bones send signals about body position to the brain. The brain regulates the position of bones by controlling muscles.

               5+ Facts About Its Body System And Its Parts

  • At birth the human skeleton is made up of around 300 bones. By adulthood, some bones have fused together to end up with 206 bones.
  • Human bones grow continually from birth till our mid 20's. Our skeleton's bone mass is at its maximum density around the age of 30.
  • If broken our bones will re-grow and repair themselves. Often doctors will place a cast on splint to make sure these bones repair straight and true.
  • The axial skeleton part of the human skeleton has 80 bones. It includes the vertebral column, the rib cage and the skull and helps us maintain our upright posture, by spreading the weight in the head, and upper areas down to the lower areas near the hips.
  • The appendicular skeletal section of our skeleton has 126 bones. It includes the pectoral (shoulder) girdles, the pelvic girdle and the bones of the lower and upper limbs. Its function is for movement of the body and to protect some organs.
  • The human skeletal system has six major functions including the production of blood cells, for support, for movement, for protection, for storage of ions and endocrine regulation.
  • The longest bone in the human body is the thigh bone called the femur.
  • The smallest bone found in the human body is located in the middle ear. The staples (or stirrup) bone is only 2.8 millimetres (0.11 inches) long.
  • Like our skin, the human body's bones are also constantly worn down and re-made, to the point where every 7 years we essentially have a new bone.
  • The area of our body with the most bones is the hand, fingers and wrist where there are 54 bones.
  • Our teeth form part of the skeletal system, but are not counted as bones.
  • There a just a few differences between human male and female skeletons. The female skeleton is generally slightly smaller and the pelvis bones differ in shape, size and angle in order to assist with child birth.
  • The majority of human bones have a dense, strong outer layer, followed by a spongy part full of air for lightness, while the middle contains a soft, flexible, tissue substance called bone marrow.

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