★ Your Body Quiz
When we breathe in, oxygen goes into our lungs. The Lungs are part of the:
A. Muscular System
B. Circulatory System
C. Respiratory System
D. Digestive System
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When you walk, muscles in your legs contract and relax. This is a great example of the ____ system in action.
A. muscular system
B. circulatory system
C. execratory system
D. nervous system
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