[Biology][Practical-8] Muscle Contraction High Yield Questions

General Discussion
1

MUSCLE CONTRACTION

  • I-band is made of actin filaments

  • A-band is made of myosin which may overlap with actin filaments

  • H-band is made of myosin only

  • Z-line is made of actin filaments that belong to the neighboring sarcomeres

  • M-line does the connection between myiosin filaments

  • Where can you find myosin within the sarcomere’s structure? H and A band

  • Where can´t you find myosin within the sarcomere´s structure? Z line and I band

  • Describe the sliding mechanism in your own words

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  • How is the actin and myosin cross-bridge formed?

    • The binding sites of the myosin head are covered by blocking proteins called troponin and tropomyosin

    • The binding of Calcium to these blocking proteins affects the complex in a way that forces the complex to expose the active site on the actin for the myosin head to attach

    • The myosin heads then form a cross-bridge with the actin filaments

  • A single motor axon innervates each skeletal muscle fiber

  • The motor unit is the group of fibers innervated by the same neuron

  • What chemical reaction is necessary for the sliding mechanism? ATP hydrolysis

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I think there’s a mistake here, I think its supposed to be myosin. Or Z band instead of H band.