A1 - Skeletal System

• Osteoclasts are the bone cells that are responsible for destroying or cleaning away old bone tissue
• Weight-bearing exercises stimulate these cells to destroy old bone tissue which then acts to stimulate the osteoblasts to build new bone tissue which is called remodelling. The effect of this process helps to build stronger bones
• Weight-bearing exercises are exercises that involve holding a person's body weight, therefore activities such as walking and jogging would be classed as weight-bearing. However, activities such as cycling and swimming would not be classed as weight-bearing as neither of these types of exercise require a person to hold their body weight
• Synovial fluid is the fluid in synovial joints that helps to lubricate the joint
• Taking part in a single bout of exercise will increase the amount of synovial fluid released in the joint and reduce the viscosity of the fluid. This helps the synovial joints that are involved in the exercise to move more freely, so helps with mobilisation of the joints