question: What when contracting causes a person 's elbow to straighten?
choices.text: Muscles in the upper arm. Stomata closing Legionnaires' disease Contracting Pupil. Femur. sensory nerve cells Elbow crease. less friction
choices.label: A B C D E F G H
formatted_question: What when contracting causes a person 's elbow to straighten? (A) Muscles in the upper arm. (B) Stomata closing (C) Legionnaires' disease (D) Contracting Pupil. (E) Femur. (F) sensory nerve cells (G) Elbow crease. (H) less friction