Muscle Contraction.

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Muscle Contraction

Color-Code Diagram

Muscle Contraction Videos Skeletal muscle structure https://www.youtube.com/watch?v=XoP1diaXVCI Muscle Contraction Process: Molecular Mechanism https://www.youtube.com/watch?v=hr1M4SaF1D4 Beef Muscle Contraction and Relaxation (MUTE) https://www.youtube.com/watch?v=_9WL8x-pLMg&list=PL4OSE4- QLEv1ZAp80Ru90Tz8ob8jYyvbO&index=16

Nerve signals stimulate muscle contractions

Muscle Cell Broken Down

Contractile Unit: Sarcomere Thin Actin  Thick Myosin

Muscle Proteins: Troponin and Tropomyosin

Myosin binding to Actin

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

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

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