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

Hemoglobin is an iron-containing protein in red blood cells that carries oxygen. The iron atoms in hemoglobin bind to oxygen molecules, allowing transport throughout the body. Chlorine, calcium, and other elements are not the main constituents of hemoglobin.

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