★ Respiratory and Circulatory Quiz
The system responsible for gas exchange of oxygen in and carbon dioxide out of the body.
A. Respiratory
B. Immune
C. Digestive
D. Nervous
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What happens when you exercise?
A. Your heart beats faster, delivering more oxygen to your muscle cells
B. Your heart beats faster, delivering less oxygen to your muscle cells
C. Your heart beats slower, delivering more oxygen to your muscle cells
D. Your heart beats slower, delivering less oxygen to your muscle cells
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