Musculoskeletal System

• Size Principle

  Motor units are recruited in order of size, from smallest to largest
• All or Nothing Principle


  If a single nerve fibre is stimulated, it will always give a maximal response and be over a certain threshold to stimulate a contraction
• reciprocal inhibition

  Muscles work in pairs to enable movement. Reciprocal inhibition describes the process of muscles on one side of a joint relaxing to accommodate contraction on the other side of that joint
• functions of the skeletal system

  Protection, shape, support, movement, blood production
• functions of the muscular system

  Movement, posture, maintaining bodily functions