1. Muscle Contraction

2. Color-Code Diagram

3. Muscle Contraction Videos
Skeletal muscle structure
Muscle Contraction Process: Molecular Mechanism
Beef Muscle Contraction and Relaxation (MUTE)
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4. Nerve signals stimulate muscle contractions

5. Muscle Cell Broken Down

6. Contractile Unit: Sarcomere
Thin Actin 
Thick Myosin

7. Muscle Proteins: Troponin and Tropomyosin

8. Myosin binding to Actin

9. Contractile Unit: Sarcomere
Thin Actin 
Relaxed Muscle
Thick Myosin
Contracted Muscle

10. Basic steps to a muscle Contraction:
Step 1: Nerves stimulate the muscles
Step 2: Calcium is released
Step 3: Calcium binds to troponin
Step 4: Tropomyosin moves out of the way
Step 5: Myosin binds to actin
Step 6: Myosin pulls actin closer causing a muscle contraction
Step 7: Calcium is removed
Step 8: Myosin detaches from Actin
Step 9: Muscle relaxes