What type of blood cells are specifically designed to attack and destroy pathogens?

Leukocytes, commonly known as white blood cells, play a crucial role in the immune system by identifying and eliminating pathogens such as bacteria, viruses, and other foreign invaders. There are several types of leukocytes, each with specialized functions. For example, lymphocytes, including T cells and B cells, are particularly important for adaptive immunity, while neutrophils and macrophages are key players in the innate immune response.

In contrast, platelets are primarily involved in blood clotting and do not have a role in attacking pathogens. Erythrocytes, or red blood cells, are responsible for transporting oxygen throughout the body and also do not engage in immune responses. Antigens, on the other hand, are substances that provoke an immune response, but they are not cells. Therefore, leukocytes are the specific blood cells dedicated to combating pathogens, making them the correct choice for this question.