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Actin/Myosin

Actin/Myosin. Homework Due. Definitions Striated Muscle Voluntary Muscle Fascicle Endomysium Perimysium Epimysium Pg. 185 #1-4. Homework Due Monday. Define in your notebook: Sarcolema Myofibrils Thick filament Thin filament Actin Myosin. QUIZ!. Clear your desk. Review.

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Actin/Myosin

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  1. Actin/Myosin

  2. Homework Due • Definitions • Striated Muscle • Voluntary Muscle • Fascicle • Endomysium • Perimysium • Epimysium • Pg. 185 #1-4

  3. Homework Due Monday • Define in your notebook: • Sarcolema • Myofibrils • Thick filament • Thin filament • Actin • Myosin

  4. QUIZ! • Clear your desk

  5. Review • Oxygen efficient • Necessary for extended muscle contraction (over time) • Longer time before fatige

  6. Review • Anaerobic • Speed and strength • Fatigue quickly • Type II(a) • Combination of type I and type II • Type II(b) • Classic fast twitch • Rapid firing

  7. Review

  8. Actin/Myosin • Skeletal muscles are multinucleate • Myofibrils run longitudinally along the muscle • Alternating Light (I) bands and Dark (A) bands give muscle its striped appearance

  9. Actin/Myosin • At a much smaller level, myofibrils are made up of smaller myofilaments • Myofilaments composed of 2 different types of contractile proteins, Actin and Myosin • Slide past each other to create a shortening (contraction)

  10. Neuron

  11. Neuromuscular Junction • All muscle must be stimulated • In between axon and muscle is a neuromuscular junction • Motor axon breaks into several branches called axon terminals • Each branch forms a neuromuscular junction with a single muscle cell • 1 neuron stimulates many muscle fibers • Motor unit – neuron and all the muscles it stimulates

  12. Neuromuscular Junction • Neuron and muscle fibers DO NOT touch • Separated by small, fluid filled gap called the synaptic cleft • Acetylcholine (neurontransmitter) carries the impulse across the gap and delivers the message • If enough acetylcholine is released, the permeability of the receiver changes, allowing for sodium to enter the surface • Results in possible muscle contraction

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