Arteries carry oxygen-poor carbon dioxide-richoxygen-rich hemoglobin-poor blood away from the heart.
When a person has been holding his or her breath for too long, the brain will force the person to breathe before a dangerous amount of oxygendiffusionexhalationcarbon dioxide builds up in the bloodstream.
The heart pumps blood to the lungsall parts of the body the alveolithe heart.
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