题目内容
Approximately how many times do you breathe in every day?
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What is the process called that uses oxygen and results in the production of the ATP we use as energy?
The level of red blood cells in the blood is regulated by which organ(s)?
To ensure sufficient oxygen diffusion, the lungs contain hundreds of millions of miniature balloon-like projections. This increases the lungs’ surface area to approximately how many square meters?
Which of the following are necessary for oxygen to reach the cells of your body?
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