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Types of Muscle, structure and Function
Types of muscle ► 3 General types ► 1) Smooth (visceral) muscle ► Loosely associated fibers ► Peristalsis ► Found in dig. tract, lungs, arteries
Cardiac Muscle ► Tightly associated fibers ► Gap junction and intercalated discs allow for quick exchange between cells ► Found only in the heart
Skeletal Muscle ► Tightly associated fibers ► Responsible for moving the skeleton ► Found everywhere in the body attached to skeleton
Structure of Skeletal Muscles ► Long thin fibers of sarcomeres connected end-to- end ► Fibers bundled into fascicles
Sarcomere ► Basic unit of contraction ► Sarcolemma surrounds it ► Actin – thin filament ► Mysosin- thick filament ► Tropomyosin covers myosin clubs to prevent bonding during relaxation
How contraction occurs ► Brain triggers muscle to contract ► Message travels down nerve ► Crosses synapse and hits sarcolemma
Next…. ► Sarcolemma releases Calcium ions into sarcomere ► Ca binds with troponin ► Triggers tropomyosin to move
Contraction begins ► With tropomyosin out of the way, myosin clubs attach to actin filament ► Forms cross bridges
Finally… ► ATP binds to cross bridge ► Causes club position to move ► Pulls actin fiber with it ► Shortened sarcomere = contraction
After contraction ► ATP is required to break bonds and relax muscle ► Rigor mortis
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