Which one of the following statements about blood elements is correct?

Red blood cells’ number is same as that of white blood cells and platelets.

The number of white blood cells is more than red blood cells.

The number of red blood cells is the highest.

The number of red blood cells is lower than platelets.

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This question was previously asked in

UPSC CAPF – 2018

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Blood is composed of plasma and blood cells (also called formed elements). The main types of blood cells are Red Blood Cells (RBCs or erythrocytes), White Blood Cells (WBCs or leukocytes), and Platelets (thrombocytes). Their relative numbers per unit volume of blood are vastly different. RBCs are by far the most numerous, with typical counts in millions per microliter (around 4-6 million/µL). Platelets are the second most numerous, with counts in the hundreds of thousands per microliter (around 150,000-450,000/µL). WBCs are the least numerous, with counts in the thousands per microliter (around 4,000-11,000/µL). Therefore, the number of red blood cells is the highest among the blood elements.

The relative abundance of formed elements in blood follows the order: Red Blood Cells > Platelets > White Blood Cells.

Each type of blood cell has distinct functions: RBCs transport oxygen, WBCs are involved in the immune system, and Platelets are crucial for blood clotting. Abnormal counts of any of these can indicate various health conditions.

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