What is the primary function of white blood cells?

The primary function of white blood cells is to fight disease and foreign elements. White blood cells, or leukocytes, are crucial components of the immune system. They play a vital role in protecting the body against infections caused by viruses, bacteria, fungi, and other pathogens.

These cells are involved in identifying and attacking harmful invaders, as well as coordinating immune responses. For example, some white blood cells produce antibodies that tag pathogens for destruction, while others directly attack and destroy these invading organisms. Additionally, white blood cells can remember past infections, which allows for a quicker and more effective response if the body encounters the same pathogen again.

The choices regarding transporting nutrients, facilitating digestion, and regulating blood pressure pertain to functions handled by other systems and types of cells in the body. For instance, red blood cells are responsible for transporting oxygen and nutrients, the digestive system handles digestion, and various mechanisms in the cardiovascular system regulate blood pressure. Thus, these options do not align with the primary role of white blood cells in the immune response.