1. Need a reason to smile today? There are about 60 muscles in the face. It takes about 40 muscles to frown, but only 20 muscles to smile. Smiling is easier than frowning!

2. There are about 650 muscles in the human body!

3. The Muscular System

4. Functions: – Movement – Warmth – Posture Muscle Properties: – Ability to contract – Ability to stretch – Ability to respond to a stimulus

5. 3 Types of Muscles Smooth: not under voluntary control (stomach, blood vessels, intestines) Cardiac: not under voluntary control (heart) Skeletal: responsible for voluntary movements (attached to bone)

6. Bicep Tricep Straighten your arm. What happens to your biceps? Your triceps? Now bend your arm. What happens to your biceps? Your triceps?

7. Most skeletal muscles work in opposing pairs. When one muscle contracts, the other relaxes!

8. What connects skeletal muscles to bones? A.Ligaments B.Tendons C.Both D.Neither

9. Which type of muscle helps you digest your food? A.Smooth B.Cardiac C.Skeletal D.None of the above

10. What type of muscle plays a role in involuntary movements? A.Smooth B.Cardiac C.Skeletal D.None of the above

11. What type of muscle are your biceps? A.Smooth B.Cardiac C.Skeletal D.None of the above

12. What type of muscle is your Achilles Tendon? A.Smooth B.Cardiac C.Skeletal D.None of the above Tendons are not muscles! Tendons are a type of connective tissue & actually belong to the skeletal system!

13. Muscular Dystrophy A genetic disease that weakens the muscles – No cure Video to 2:40

14. Muscle Fatigue Activity How many times can you squeeze the clamp?