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Unformatted text preview: 1 Muscles and muscle contraction Muscle • Comprises largest group of tissues in body • Three types of muscle – Skeletal muscle • Make up muscular system – Cardiac muscle • Found only in the heart – Smooth muscle • Appears throughout the body systems as components of hollow organs and tubes • Classified in two different ways – Striated or unstriated – Voluntary or involuntary Structure of Skeletal Muscle Membrane Striated appearance 2 Structure of Skeletal Muscle • Titin – Giant, highly elastic protein – Largest protein in body, however collagen has the highest representation – Extends in both directions from M line along length of thick filament to Z lines at opposite ends of sarcomere – Two important roles: • Along with M-line proteins helps stabilize position of thick filaments in relation to thin filaments • Greatly augments muscle’s elasticity by acting like a spring Structure and Arrangement of Myosin Molecules Within Thick Filament Muscle contraction requires ATP Thin Filament What do you notice about the binding sites? 3...
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- Winter '08
- muscle divides muscle