What type of blood cell is primarily responsible for immune responses?

White blood cells, also known as leukocytes, are primarily responsible for immune responses in the body. They play a crucial role in identifying and combating pathogens such as bacteria, viruses, and other foreign invaders. There are several types of white blood cells, including lymphocytes (such as T cells and B cells), neutrophils, and monocytes, each with specialized functions in the immune response.

When an infection occurs, white blood cells are activated and mobilized to the site of the infection, where they can engulf and destroy pathogens, produce antibodies, and communicate with other immune system components to coordinate a response. Their ability to adapt and remember specific pathogens enables the body to mount faster and more effective responses to subsequent exposures.

In contrast, red blood cells primarily transport oxygen and carbon dioxide, platelets are involved in blood clotting, and plasma cells, which are a specific type of B cell, are responsible for producing antibodies but still fall under the broader category of white blood cells. Thus, the role of white blood cells in immune responses is essential and central to maintaining health and defending against disease.