Final answer:
Neutrophils account for more than 50% of white blood cells (WBCs) and play a critical role in the immune response to bacterial infections.
Step-by-step explanation:
The cells that account for more than 50% of white blood cells (WBCs) are Neutrophils. Neutrophils are a type of granulocyte and are the most common type of WBC. They make up approximately 50-70% of the total leukocyte count. Neutrophils play a critical role in the immune response to bacterial infections.