Which type of blood cell is primarily responsible for transporting oxygen in the bloodstream?

• A. Monocytes
• B. Platelets (thrombocytes)
• C. Erythrocytes (red blood cells)
• D. Neutrophils

Answer: (C)

Verified step by step guidance

1. Understand the main function of each blood cell type listed: Monocytes are a type of white blood cell involved in immune defense, Platelets (thrombocytes) are responsible for blood clotting, Neutrophils are white blood cells that fight infection, and Erythrocytes (red blood cells) transport oxygen.
2. Recall that oxygen transport in the bloodstream is primarily carried out by cells containing hemoglobin, a protein that binds oxygen molecules.
3. Identify which blood cell contains hemoglobin: Erythrocytes (red blood cells) contain large amounts of hemoglobin, enabling them to carry oxygen efficiently.
4. Recognize that the other cells listed (Monocytes, Platelets, Neutrophils) do not have hemoglobin and therefore do not transport oxygen.
5. Conclude that the blood cell type primarily responsible for transporting oxygen in the bloodstream is the Erythrocyte (red blood cell).