Jeff was trying to toning his abdomen. However, he over-exerted himself and started to feel severe pain whenever he twisted his trunk (from left to right). If he simply did the sit-up without twisting his trunk, he did not feel the same degree of pain. Explain which muscle was damaged, and briefly explain why. B. When you open your mouth (such as when saying Ahh… at a physical exam ), which muscles are contracting, and which muscles are relaxing? How about when you are clenching your teeth or biting hard into a nut, which muscles are contracting, and which muscles are relaxing?

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