Innate Immune System- An Introduction

Innate Immune System- An Introduction

Introduction The innate immune system provides the first line of host defense against microbes, before adaptive immune responses have had sufficient time to develop. The mechanisms of innate immunity exist before exposure to microbes. The cellular components of the innate immune system include epithelial barriers and leukocytes (neutrophils, macrophages, NK cells, lymphocytes with invariant antigen receptors, and mast cells). The innate immune system uses cell-associated pattern recognition receptors, present on plasma and endosomal membranes and in the cytosol, to recognize … Read more

29 Differences between Innate Immunity and Adaptive Immunity

Differences between Innate Immunity and Adaptive Immunity

Some of the differences are: S.N. Characteristics Innate Immunity Adaptive Immunity 1. Synonyms Nonspecific, natural immunity Specific, acquired immunity 2. Definition The defense mechanisms that are non-antigen specific and immediately come into play on the antigen’s appearance in the body.  The defense mechanism that is not always present but involve antigen-specific immune response. 3. Order of defense It is the first line of defense of immune system. It is the action against pathogens that are able to evade or overcome … Read more

19 Differences between Active Immunity and Passive Immunity

Differences between Active Immunity and Passive Immunity

Image Source: BioNinja. The major differences are: S.N. Characteristics Active Immunity Passive Immunity 1. Definition The protective immunity in which the individual’s own immune system is stimulated to produce antibodies and lymphocytes. The immunity in which a person receives antibodies or lymphocytes that have been produced by another individual’s immune system. 2. Exposure to Antigen Requires exposure to a pathogen or to the antigen of a pathogen. Does not require exposure to an infectious agent or its antigen. 3. Immune system involvement The immune … Read more

20 Differences between Humoral Immunity and Cell mediated Immunity

Differences between Humoral Immunity and Cell mediated Immunity

Image Source: Pinterest. Here are some differences: S.N. Characteristics Humoral Immunity Cell-mediated Immunity 1. Definition The immunity mediated by macromolecules found in the extracellular body fluids is called humoral immunity. (“humor” a medieval term for body fluid) The immunity that identifies and destroys infected cells in the body is called cell-mediated immunity. 2. Mediator The main cell involved in humoral immunity are B-cells. The main cell involved in cell-mediated immunity are T-cells. 3. Components B cells, T cells, and macrophages. … Read more

What is Immunology?

Immunology

What is Immunology? Immunology is the study of how the body responds to foreign substances and fights off infection and other disease. Immunologists study the molecules, cells, and organs of the human body that participate in this response. Immunity Immunity is a condition of being able to resist a particular disease especially through preventing the development of pathogenic microorganism or by counteracting the effects of its products. Innate immunity is something already present in the body and non-specific. Innate immunity is … Read more