1. Muscles

2. 4 functions of muscles
Movement

3. 4 functions of muscles Movement
Maintaining posture (your muscles are working to keep you standing up, even if you are not moving).

4. 4 functions of muscles Movement Maintaining posture
Stabilizing joints (some joints are held in place by muscles)

5. 4 functions of muscles Movement Maintaining posture Stabilizing joints
Heat release (75% of energy expended during muscle movement becomes heat).

6. 4 functions of muscles Movement Maintaining posture Stabilizing joints
Heat release (75% of energy expended during muscle movement becomes heat).

8. What is the difference between tendons and ligaments?

9. Think of the 5 constraints
Compression
Tension
Torsion
Deflection
Shearing
Which one(s) do your muscles undergo to allow movement?

10. Tension! Muscles can only pull. They can never push.
Because of this, muscles will work together in pairs. One muscle will contract (get shorter), while its partner will extend (get longer).
This type of relationship is called an antagonistic relationship.
What is the best example of this?

12. Skeletal muscle Skeletal muscles are striated (they have stripes)
They are responsible for voluntary movement (you control them).
They are strong, but can get tired easily.
Examples:

13. Smooth muscle Smooth muscles have no striations
They are responsible for involuntary movement (you don’t have to think about it to move them).
They are weaker, but have stronger endurance.
Responsible for peristalsis

14. Cardiac muscle Very fibrous muscle that is found only in the heart.
Very strong, it contracts nonstop over your whole life.
Involuntary movement.