Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. Give examples of antagonistic muscles in the arms and legs.
   • The muscle on top of the upper arm is called the Bicep. The muscle on underside of the upper arm is called the Tricep. The muscle on front of the upper leg is called the Quadriceps. The muscles on back of the upper leg are called the Hamstrings. The muscles between the ribs are called intercostal muscles.
2. How are the bones at a joint held together?
   • Joints are held together (bone to bone) by Ligaments. Muscles are connected to bones by Tendons.
3. What is the difference between a ligament and a tendon?
   • Ligaments are elastic (stretchy) to allow movement. Tendons are not elastic to all muscles to exert a Force on the bones.
4. What do muscles do to apply a force and is it a pulling or pushing force?
   • Muscles can only contract (pull) exerting a Force and relax applying no Force. Muscles can not
5. When one muscle in an antagonistic pair is contracted, what will the other muscle do?
   • To raise the lower arm, the Bicep must contract while the triceps relaxes and vice versa.