PE - 1.2.4 - A healthy active lifestyle and your muscular system

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  • Created by: kateq
  • Created on: 06-05-13 22:24

Role of muscular system:

  • muscles move by contracting and lengthening (relaxing)
  • muscles define body shape and maintain posture
  • work either voluntarily through planned contractions
  • or involuntarily where muscles contract and lengthen by themselves (internal organs)
  • voluntary muscles cause movement which people conciously control
  • can be trained to be stronger and work for long periods of time without getting tired
  • muscular endurance - light weights, lots of reps
  • muscular strength - heavy weights, few reps

Movements of the body


  • adding to the body
  • bringing part of the body towards center


  • opposite to adduction
  • movement away from the center


  • decreasing the angle between a joint


  • opposite to flexion
  • increasing the angle between the joint


  • angle of joint doesn't change
  • moves in a circular motion

Muscles of the body


  • muscles attached to bones by tendons
  • muscles can only contract to produce movement by pulling the bone
  • a second muscle is needed to pull the bone the other way
  • muscles arranged in antagonistic pairs
  • one muscle contracts, other relaxes to produce movement
  • e.g. biceps and triceps - elbow flexes and extends
  • hamstrings and quadriceps - flexion and extension at knee
  • Deltoid - abducts arm at shoulder - serve in tennis
  • trapezius - rotates the shoulder blades backwards - rowing
  • lattisimus dorsi - rotates upper arm at shoulder - swimming butterfly
  • pectoral - adduction of the arm - swimming front crawl
  • abdominals - flexion and rotation of hip - heading a football
  • biceps - flexion at elbow - bending the arm to throw a cricket ball
  • triceps…


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