Pdhpe Notes

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Skeletal System-
Functions:
1. Support- To give our bodies structure and form
2. Protection- Protect vital internal organs, e.g. Cranium or skull protects the brain 3. Movement- Works with muscles to allow movement
4. Mineral Storage- Stores calcium in our bones
5. Blood Cell Production- Red Blood Cells carry oxygen, white blood cells fight off viruses 6. Storage of Energy- Stores extra energy incase you run out

* Ligaments- Are a fibrous band of connective tissue that connect bone to bone and is to help maintain stability by limiting excessive movement. * Tendons- Add joint stability by helping to keep joints closed. Tough inelastic tissue that attach muscle to bone. * Cartilage- Allows bones to move freely over one another. This stops friction occurring and the degeneration of the bone. (found in small sacs called Bursa) * Synovial Fluid- Acts as a lubricant in a joint. Helps keeps moving surfaces apart and provides a cushioning or shock absorbing effect. * LIGAMENTS= BONE TO BONE

TENDONS= MUSCLE TO BONE

* AGONIST The contracting or shortening muscle.
* ANTAGONIST The relaxing or lengthening muscle.
* STABILISERS Provides stabilization. The muscle partially contracts during movement in order to support the main movement occurring.

* ISOMETRIC (Static Contraction) Muscle contracts but does not change in length. Two Types of Isotonic Contractions are:
* CONCENTRIC Muscle shortens, contracts, working muscle. (Also known as the AGONIST) * ECCENTRIC Muscle lengthens, relaxing muscle. (Also known as the ANTAGONIST) * ISOTONIC (Dynamic Contraction) Muscle contracts and there is change in length causing movement.

* FUNCTION OF BONES To keep our bodies in place and protect other major parts of our body. (cranium protects the brain) * What are ligaments Join Bone to Bone and are there to avoid the clashing of bones. * 3 Types of Joints Synovial, Cartilage and...
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