1. MUSCLES
Chapter 1.4

2. What are Muscles? Muscles are the main organs of the system
Composed of Muscle Fibers
Long and thin cells
Myofibrils allow for muscles to contract

3. MUSCLES There are over 600 muscles in the body. All muscles contract
There are 3 kinds of muscles

4. Three Kinds of Muscle

5. SKELETAL MUSCLES Connects to bones… causes them to move
Voluntary muscles
You make them move
These muscles react quickly and tire quickly
They work in pairs

6. Tendon vs. Ligament

7. Movement
When your muscle contracts (shortens) it pulls on the tendon, which pulls on your bone and they move together

8. The biceps are the flexor
The triceps are the extensor

9. SMOOTH MUSCLE Does not have bands
They contract without you thinking about it
involuntary muscle
Controls breathing, blood pressure, and digestion
Reacts slowly and tires slowly

10. CARDIAC MUSCLE 1. Only found in the heart 2. Involuntary
3. Do not tire out
4. Produce their own signal

11. Keeping your Muscular System Healthy
Use it or lose it!
Resistance Exercising
strengthens Skeletal Muscle
Use of Weights and bands
Aerobic Exercise
Strengthens the Heart
Any activity that causes your heart rate to increase
Always warm-up and stretch