Muscles

    Muscles
    Which muscles extend the leg?
    Anatomically “leg” refers to the limb between the knee and ankle. Extension of the leg is achieved by contacting the quadriceps (on the front of the thigh).
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    Muscles
    Which muscle and bone listed below do NOT work together in combination?
    The biceps femoris lies adjacent to the femur, not the humerus.
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    Muscles
    What structure attaches a muscle to a bone?
    A tendon is part of a muscle. Ligaments attach bones to each other, while cartilage covers the articulating surfaces of bone.
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    Muscles
    The space between the ribs is filled with:
    “Costa” means rib. Intercostal means between the ribs.
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    Muscles
    On what part of the body is the serratus anterior muscle located?
    “Anterior” refers to front, so choice B is wrong. There is no “serratus” region.
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    Muscles
    What characteristic of a smooth muscle cell distinguishes it from cardiac and from skeletal muscle?
    Both cardiac and skeletal muscle show striations when viewed under the microscope, but smooth muscle does not.
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    Muscles
    Which of the following muscle cell structures is the longest?
    A muscle cell is a bundle of myofibrils. Myofibrils contain many sarcomeres joined end to end. Within sarcomeres are found (the shorter) thick and thin myofilaments.
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    Muscles
    Which muscle naming criteria are used to name the quadriceps femoris?
    Femoris refers to location on the femur; quadriceps refers to four origins.
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    Muscles
    Of the events that lead to myofilaments sliding over each other, which of the following happens first?
    Ca must first enter the cytoplasm in order to bind with troponin. Once the binding site is exposed, the myosin head may engage the site. Prior to engagement, ATP must be hydrolysed to ADP.
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    Muscles
    What action does the flexor carpi ulnaris perform?
    The flexor carpi ulnaris and the flexor carpi radialis perform the same action – flexing the wrist; the former lies superficial to the ulna bone, while the latter is adjacent and superficial to the radius bone.
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