Sia observed that while eating food she was only moving her lower jaw and not the upper jaw. Give reason for the same.
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Sia observed that while eating food she was only moving her lower jaw and not the upper jaw. Give reason for the same.
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The temporomandibular joints (TMJs) allow the lower jaw to move smoothly. The lower jaw (mandible) supports the bottom row of teeth and gives shape to the lower face and chin. This is the bone that moves as the mouth opens and closes.
Answer:
Sia Can only move one jaw while eating because the upper jaw is connected with the skull by an immovable joint while lower jaw is connected by a movable joint which makes the movement possible. The lower jaw only move because the upper jaw is fixed to the skull.