Understanding Red Blood Cells and Anemia

Red blood cells, making up 40% of blood volume, are produced in the bone marrow and resemble flattened doughnuts. They contain hemoglobin, a red protein that gives blood its color. As blood circulates through the lungs, oxygen binds to hemoglobin, which then transports it throughout the body, releasing it to cells and tissues. Once hemoglobin releases oxygen, it collects carbon dioxide and waste gases to be expelled from the lungs. Anemia, characterized by a deficiency of red blood cells or hemoglobin, often results in exhaustion.

What percentage of blood volume is made up by red blood cells?

• 20%

• 40%

• 60%

• 80%

What is the primary function of hemoglobin in red blood cells?

• To produce energy

• To digest nutrients

• To transport oxygen

• To fight infections

How do red blood cells release oxygen to the body?

• By attaching to carbon dioxide

• By dissolving in the bloodstream

• By releasing it to cells and tissues

• By converting it to water

What happens to hemoglobin molecules after they release oxygen?

• They are expelled from the body

• They dissolve in the blood

• They attract carbon dioxide

• They become inactive

What is a common symptom of anemia?

• Weight gain

• Rapid heartbeat

• Exhaustion

• Increased appetite