1. The Muscular System
What do skeletal muscles do?
How do muscles work?

3. Functions of Muscle Tissue
Produce movement
Muscle pulls tendons to move the skeleton
Maintain posture and body position
- Continuous muscle contraction
Support soft tissue
-Support weight of visceral organs
Movement of substance around the body
- Regulate blood flow, movement of food, urine….
Maintain body temperature

4. Types of muscles tissue

5. Skeletal Muscle Muscles are bundles of cells and fibres.
Muscles work in a very simple way; all they do is contract or relax.
Muscles can only pull, they never push.
Muscles generally work in pairs to produce movement: when one muscle contracts the other relaxes.
There are 630 active muscles in your body

6. Muscle Action
Skeletal muscles produce movement by putting force on tendons, which pull bones.
When muscle contracts it shortens and pulls two jointed bones together.

7. The opposite movement:
An example
Contraction of the biceps and a relaxation of the triceps. This produces a bend at the elbow
The opposite movement:
Contraction of the triceps and relaxation of the biceps produces the effect of straightening the arm.

8. Muscle contractions require energy
Blood vessels deliver oxygen and nutrients to produce ATP
ATP is the cellular energy molecule produce in the mitochondria
Muscle contractions are stimulated by the CNS
Voluntary control
Axons of neurons connect to individual muscle fibers

9. Anterior View

10. Posterior View

11. Injuries to Muscular System
Tendonitis
Inflammation of a tendon
Usually found in athletes
Muscular dystrophy
Muscles break down and you become paralyzed

12. The muscular system
BBC MUSCLE GAME