Table of Contents

Myosin Molecule

Myosin Molecule (cont)

Actin "Thin" Filament

Actin

Troponin

Relationship Between Thick and Thin Filament

How do Muscles Contract?

Cros-Bridge Activity

Regulation of Contraction

Role of Troponin and Tropomyosin

Role of Troponin and Tropomyosin (cont)

Role of Troponin and Tropomyosin (cont)

Role of Troponin and Tropomyosin (cont)

How do we get Calcium on the Scene?

Role of ATP

Cross-Bridge Cycle

Energy Sources