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How long does it take for a single red blood cell to travel through the body and return to the lungs? A) 1 day B) 1 hour C) 1 minute D) 1 second E) 5 minutes

User Nighil
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A single red blood cell takes approximately **20 to 60 seconds** to travel through the body and return to the lungs. So, none of the options (A, B, C, D, or E) are entirely accurate, but the closest option would be **C) 1 minute**. Keep in mind that the actual time may vary depending on factors like the individual's activity level and overall health.
User Beseder
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