Multiple choice

Red blood cells carry

  1. oxygen

  2. nitrogen

  3. argon

  4. carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Red blood cells contain hemoglobin, a specialized protein that binds to oxygen in the lungs and delivers it to cells throughout the body. While they also transport some carbon dioxide back to the lungs, their primary function is oxygen delivery. They do not transport inert gases like nitrogen or argon.

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