1. Muscular System

2. Muscular System

4. Muscle Tissue

5. Skeletal Muscles
Voluntary muscles Made of skeletal muscle tissue Attach to the bones of your skeleton Always work in pairs Muscles/muscle cells can only contract (get shorter) and relax (go back to original size)) Examples: biceps and triceps, quadriceps and hamstrings

6. Smooth Muscles Involuntary muscles Move your internal organs
React more slowly
Tire more slowly

7. Cardiac Muscle Involuntary Only found in your heart Doesn't get tired
Contracts repeatedly 
(heart beat)