What is the cells fight disease and pathogens in body of an animal?

White blood cells, also called leukocytes, are specialized cells in the body that form an important part of the immune system. They help protect the body by fighting off infections and diseases. There are different types of white blood cells, each with specific functions:

- Neutrophils: These are the most abundant type of white blood cells. They are the first responders to infections and help engulf and destroy foreign particles, such as bacteria.

- Lymphocytes: Lymphocytes include B cells, T cells, and natural killer (NK) cells. B cells produce antibodies that recognize and bind to specific antigens, helping to neutralize them. T cells help kill infected cells and regulate immune responses. NK cells also attack and kill infected or abnormal cells.

- Monocytes: These cells develop into macrophages, which reside in tissues and help engulf and destroy foreign substances, including pathogens.

- Eosinophils: Eosinophils are involved in defending against parasitic infections and allergic reactions.

- Basophils: Basophils release chemicals like histamine, which play a role in inflammatory responses and allergic reactions.

White blood cells circulate throughout the body, constantly monitoring and responding to any threats. When they encounter foreign substances or pathogens, they activate immune responses to neutralize and eliminate the invaders. The coordinated action of different white blood cells helps maintain the body's defense system and protects it from infections and diseases.