Bones

• bodys form and function are supported by skeletal system
• 206 bones in mature human skeleton
• newborn have over 300 bones, fuse together around 9 years old
• skeletal system:

  • provides support and allows a person to stand erect
  • protect underlying organs
  • serves as a reservoir for storing such minerals as calcium and phosphorus
  • site for red blood cell formation
• long bones found in upper and lower extremities- responsible for carrying the body weight and make ambulation possible
• shirt bones found in hands and feet- shaped to provide strength in compact area
• ribs and sternum are flat and thin- provide structure
• ossification: is the process of developing new bones from tissue

  osteoblasts from bone cells lay down a framework for the new bone

  calcium and phosphorus combine to form salts, which are then deposited into the framework