Multiple choice general knowledge

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

Iron is the central component of hemoglobin, the protein in red blood cells that carries oxygen throughout the body. Each hemoglobin molecule contains four iron atoms that bind oxygen. Iron deficiency leads to anemia.

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