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Ch.10

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Terms in this set (23)

  • Striations are from what?

    Contractile protein arrangements

  • What is allowing muscle to be stretched without damage?

    extensibility

  • Dendrites __________ signals from other neurons

    receive

  • Which CT covers individual muscle fibers within a muscle?

    endomysium

  • Fascicle arrangement is correlated to:

    the force generated by a muscle and affects the range of motion

  • In the myofibril where are thick filaments predominantly located?

    A band

  • A main function of muscle is to convert chemical energy to mechanical energy. Which property of muscles relates most directly to this function?

    contractility

  • Which region is the same length as the actin filament?

    From the edge of the H zone to the Z disc

  • Which is not found in the A band?

    -M Line

    -H Zone

    -Z Disc

    -Areas w/ both actin & myosin

    Z disc

  • Which event initiates the excitation process in skeletal muscle fibers?

    Reception of the nerve signal at the neuromuscular junction

  • _____________ initiates the excitation process by receiving the nerve signal

    neuromuscular junction

  • The _________ _________ forms a synapse with the muscle fiber at the neuromuscular junction

    motor neuron

  • Voltage gated channels respond to the depolarization of an action potential by releasing Ca2+. Where are these channels located?

    sarcoplasmic reticulum

  • In a skeletal muscle fibers, which structure would you expect to have the greatest total surface area?

    sarcoplasmic reticulum

  • Which phase of contraction links the action potential in the sarcolemma to the activation of the myofilament?

    excitation-contraction coupling

  • As a result of ACh stimulation, calcium ions are released from the ________.

    sarcoplasmic reticulum

  • If a muscle cell is stimulated to contract, allowed to partially relax, then stimulated again, its force of contraction the second time will be ___________.

    higher

  • The cytoplasm of a skeletal muscle cell has a specific name and is known as _________

    sarcoplasm

  • The _______ is the structural component of the sarcomere that anchors the actin and defines the boundary between adjacent sarcomeres.

    Z disc

  • ________ contains the length of the myosin, the _______is the center of the sarcomere where myosin are linked, and the ______ is the region within the A band where only thick filaments are present.

    A band, M line, H zone

  • What is the role of calcium ions in the neuromuscular junction?

    To open voltage-gated calcium channels

  • Myoglobin requires ___ oxygen tension for oxygen release.

    low

  • What is the main form of stored energy found in muscle cells?

    creatine phosphate