Describe Flexion and Extension and Effect of Exercise On Body Flexibility

Flexion -Reducing the angle between two bones (often remembered as a bending action).

Extension -Increasing the angle between two bones (often remembered as a straightening action).

Upon arrival to PE class perform sit and reach. Record how far you can touch on your leg.

After warm up record how far you can touch on your leg.

After playing record how far you can touch on your leg.

Describe How Muscles Function

The skeletal muscles of the body provide the force needed to move the bones of the skeleton in a large variety of actions. The muscles are arranged in a way that allows them to work in pairs. For example, when we bend our arms at the elbow to curl a dumbell the bicep acts as the agonist (main force providing muscle) and contracts to pull the radius and ulna of the forearm towards the humerus of the upper arm (this action is flexion). At the same time to allow this to happen the tricep at the back of the upper arm relaxes and lengthens to allow the arm to flex. http://www.peworld.org/anatomy/muscles.htm

Describe The Functions of the Skeleton

The Functions of the Skeleton

1. Support - the shapes of soft tissues are maintained and the body has posture.

2. Protection - Important organs of the body (brain, heart, lungs, spinal cord) are protected by non-moveable casings.

3. Movement - Tendons attach muscles to bones which act as levers. Contracting muscles pulls on the bones causing movement.

4. Storage - Mineral salts are stored in the bones (e.g. calcium)

5. Blood Cell Production - Red blood cells, some white blood cells and blood platelets are produced in the red marrow of bones

http://www.peworld.org/anatomy/skeleton.htm