Muscles

    Muscles
    Where are the semimembranosus and semitendinosus muscles located?
    They are two of the three “hamstring” muscles on the dorsal thigh, the other being the biceps femoris.
    Author: rikazzz Comment
    Muscles
    Which of the following muscles is named after its origin and insertion points?
    The sternocleidomastoid has its origin on the sternum and clavicle, while it’s insertion is on the mastoid process of the temporal bone.
    Author: rikazzz Comment
    Muscles
    Which protein(s) are found in thin myofilaments?
    Actin is the major component of a thin filament. Tropomyosin covers the biding site, while troponin provides the mechanism for removing tropomyosin from the binding site.
    Author: rikazzz Comment
    Muscles
    Patients confined to bed and those with plaster casts immobilising a bone fracture suffer muscle wasting. What is the term used for this condition?
    Immobilising a bone will mean the attached muscles are not used. Their nerve supply is intact, albeit nervous stimulation is reduced.
    Author: rikazzz Comment
    Muscles
    Which of the following is NOT a common intramuscular injection site?
    The gluteus maximus is avoided so that the sciatic nerve is not pierced by the needle.
    Author: rikazzz Comment
    Muscles
    Which of the following muscles is NOT a flexor of the knee?
    The rectus femoris is on the anterior of the thigh and extends to the knee. The other three together constitute the “hamstrings” and flex the knee.
    Author: rikazzz Comment
    Muscles
    Which event causes the thick filament to slide over the thin filament (i.e. the “power stroke”) during muscle contraction?
    The attachment of the already energised cross-bridge to its binding site stimulates the head to swivel and so cause the filaments to slide over each other. Choice A causes the binding site to be exposed. Choice B energises the cross-bridge. Choice D causes detachment of the cross-bridge.
    Author: rikazzz Comment
    Muscles
    To what does the term “endomysium” refer?
    Endomysium is the connective tissue that surrounds a muscle cell (a fibre). Perimysium surrounds a muscle fascicle, while epimysium surrounds the whole muscle. The other choices are wrong.
    Author: rikazzz Comment
    Muscles
    By what name is something that attaches a bone to another bone known?
    Ligament is the “ligature” that joins articulating bones. A tendon (or an aponeurosis) attaches a muscle to a bone.
    Author: rikazzz Comment
    Muscles
    Which is the largest of the structures in a muscle fibre?
    A myofibril extends the length of a muscle cell. A myofilament is shorter than a sarcomere, while myosin is a molecule in a thick myofilament.
    Author: rikazzz Comment