Biological Foundations 111 Lab (Tuesday 6-9)
The Innate Immune System
Your immune system is made up of different cells and mechanisms that are used to defend your body against agents that cause disease called pathogens. The immune system can be divided into two sections: the innate immune system and the adaptive immune system. The innate immune system provides a defense that is active immediately upon infection and is the same whether or not the pathogen has been encountered previously. It may include barriers that protect your body such as skin and mucous membranes, phagocytic cells such as neutrophils, macrophages, dendritic cells, and eosinophils, and other cells such as natural killer cells. Innate immunity may include functions such as: recruiting immune cells to the site of infection, identifying bacteria, identifying and removing foreign substances from organs, activations of the adaptive immune system, and acting as a physical or chemical barrier to infectious agents. The adaptive immune system, which is found only in vertebrates, is much more specific and responds slower than the innate immune system. Adaptive immunity is enhanced by previous exposure to the infecting pathogen because of its characteristic of immunological memory. It may include many different types of lymphocytes. The functions of adaptive immunity are: recognition of type of antigens, the generation of responses to eliminate pathogens or pathogen infected cells, and the development of immunological memory. In this paper we will explore three main areas of the innate immune system: anatomical barriers, different cell types, and the inflammation response. The innate immune system is your body’s first defense against invading organisms. Not only is it made up of different cells to fight the invading organism but also of anatomical features that function as barriers to infection. These barrier defenses include not...