Multiple choice general knowledge science & technology

The main constituent of hemoglobin is..

  1. Chlorine

  2. Iron

  3. Calcium

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hemoglobin's key component is iron, which enables it to bind and transport oxygen. Each hemoglobin molecule contains four iron atoms that give blood its red color and allow efficient oxygen delivery throughout the body.

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