Immunology:
Immunology is the study of the immune system and its response to foreign entities, such as bacteria, viruses, and toxins. It is a branch of medical science that deals with the diagnosis, treatment, and prevention of infectious diseases. It also includes the study of the body’s natural defenses against disease-causing organisms.
Immunity:
Immunity is the body's ability to resist disease and protect itself against foreign invaders, such as bacteria and viruses. It is the body's natural defense system, which is composed of specialized cells, tissues, and organs that work together to protect the body from harmful agents.
Immune System:
The immune system is a complex network of cells, tissues, and organs that work together to protect the body from disease-causing organisms. It is composed of two main components: the innate immune system and the adaptive immune system. The innate immune system is the body's first line of defense against foreign invaders. It is composed of physical barriers, such as skin, mucous membranes, and stomach acid, as well as chemical defenses, such as antibodies and white blood cells. The adaptive immune system is the body's second line of defense against foreign invaders. It is composed of specialized cells, such as B cells and T cells, which recognize and respond to specific foreign invaders by producing antibodies that can neutralize or destroy them.