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 contains iron in its heme groups, which enables it to bind and transport oxygen throughout the body. Each hemoglobin molecule can carry four oxygen molecules. The iron gives blood its red color.

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