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    Hi,

    Would someone be able to explain what is going on in the diagram, in terms of antagonistic muscle action between muscles A and B when the mouth is opened and closed? Having trouble understanding exactly what happens.



    Thanks!
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    I think I can sort of figure it out. This is what happens when the jaw opens:

    Name:  Screen_Shot_2016_03_05_at_18_00_02 copy.png
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    Muscle A contracts and pulls on the nub of bone on the other side of the jaw joint pivot, causing the jaw, which is on the other side of the pivot, to open.

    To close the jaw, muscle B contracts:

    Attachment 510343510345

    They're antagonistic because they cause opposite effects when they contract.
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    I hope that makes sense.
 
 
 
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