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

Blood consists of plasma and suspended cellular elements: red blood cells (RBCs), white blood cells (WBCs), and platelets [1]. Among these, RBCs are the most abundant. Normal RBC counts range from approximately 4.2 to 6.1 million cells per microliter. In contrast, the normal range for platelets is significantly lower, typically between 140,000 and 450,000 per microliter. WBCs are the least numerous of the three, with a normal range of only 5,000 to 10,000 cells per microliter. While WBCs are physically larger than RBCs, they are far fewer in number. Therefore, RBCs have the highest concentration in human blood, followed by platelets, and then WBCs. This distribution ensures efficient oxygen transport via hemoglobin, which is primarily contained within the RBCs.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.7 > p. 91