Which nutrient forms haemoglobin in red blood cells?

Which nutrient forms haemoglobin in red blood cells?

• A. Iron
• B. Potassium
• C. Calcium
• D. Zinc

Answer: (A)

Haemoglobin in red blood cells relies on iron. Haemoglobin is the protein that carries oxygen, and each heme group within it contains an iron ion that reversibly binds oxygen. Without iron, the haem portion can’t form properly, so haemoglobin cannot be produced in sufficient amounts, leading to reduced oxygen transport. The other minerals have important roles in the body (potassium helps with fluids and nerve function, calcium supports bones and signaling, zinc is involved in many enzymes and immune function) but they are not components of haemoglobin.

Haemoglobin in red blood cells relies on iron. Haemoglobin is the protein that carries oxygen, and each heme group within it contains an iron ion that reversibly binds oxygen. Without iron, the haem portion can’t form properly, so haemoglobin cannot be produced in sufficient amounts, leading to reduced oxygen transport. The other minerals have important roles in the body (potassium helps with fluids and nerve function, calcium supports bones and signaling, zinc is involved in many enzymes and immune function) but they are not components of haemoglobin.