Bone
- Created by: Chloeann
- Created on: 18-11-14 13:21
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- Bone
- Jobs of the bone
- Scalffold for the body (more than 200 bones)
- Gives the body shape
- Protects the internal organs
- Life cycle of the bone
- Old bone is constantly being broken down and reformed.
- Optimum bone mass being achieved between 25 and 30
- Following this, bone mass will decrease at approx 0.3-3.4 per cent per year
- All bones are coated by the periosteum. A tough membrane that protects the bone, and yet allows blood ti travel through the bone.
- Bone is constantly being broken down and regenerated.
- The bones comprises of Blood, Collagen, nerves, and cells
- Main ones being Osteoblasts and osteocytes
- Ostoporosis occurs when the osteoblasts that help to create bone become less active than Osteocytes causing the bones to be reabsorbed into the body
- Main ones being Osteoblasts and osteocytes
- Different types of bone
- Cortical bone
- Makes up 80% of the skeleton and forms the long shafts of bone. e.g.. The fermur. They have a meduly canal with yellow fatty bone marrow in the middle
- Trabecular Bone
- Forms only 20% of the skeleton, hard outside shell, with a honey comb centre. Contains marrow between the trabecular. Forms the vertebrate, small bones in feet and the bridge that attachs the ball and socket joint
- Cortical bone
- Joints
- Attriculations that allow the joints to move.
- The articular cartalidge acts as a glove covering the ends of the two bones that form a joint.
- Covering both bones is the lining of the joint cavity (synovial membrane)
- This secrets Synovial Fluid, that lubricates the joint.
- The outside layer protecting the the joint is a tough fibrous connective tissue called 'joint capsule'.
- This secures the two ends of the bone.
- The capsule is then held in place by the capsule itself or by ligaments
- When dances are training its important for a generous intake of vitamins D and K
- Jobs of the bone
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