While sitting at your desk, you drop your pencil onto the floor. You bend over to pick up the pencil. In order to straighten up and continue your exam you must use which of the following muscles?

A. Extensor hallucis longus
B. Tibialis anterior and semimembranosus
C. Semimembranosus
D. Erector spinae
E. Tibialis anterior


Answer: D

Anatomy & Physiology

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