Which of the following is an example of an internal force commonly used when assisting patients with movement?

Question

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Muscular tension is an internal force that can be used to assist patients with movement. By tensing certain muscles, a caregiver can help a patient lift a limb or position themselves in bed. Ankle weights (A) are an external force, friction (B) is a force that opposes movement, and gravity (C) is a natural external force, but not one that can be directly used for assistance.

Which of the Following Is an Example of an Internal