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IMMUNE SYSTEM - Coggle Diagram
IMMUNE SYSTEM
The immune system is the body's defense against infections, attacks germs and helps keep us healthy.
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The immune system.
The immune system has the ability to defend the human organism from strange elements that threaten its function. This is a complex system, formed by trillions of cell and it has three essencial properties.
TYPES OF IMMUNITY
Innate immunity
Everyone is born with innate immunity, a type of general protection.
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Immunological barriers: primary, secondary and tertiary
The innate immune system has several first-line barriers against infection, which prevent the entry and growth of pathogens.
Physiological
barriers
Physiological barriers in the body are processes that occur in response to pathogens to remove them from the system and vary by location and situation. The main physiological barriers are:
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Physical barriers
These barriers provide a physical block against pathogens. The largest barrier comprises the skin, which has a large Surface área and covers most of the outer surfaces of the body. Superficially, the skin has multiple layers of dead keratinized epithelium that is shed continuously, facilitating the removal of adherent microbes.
Chemical barriers
Generally speaking, there are two main chemical barriersto infection. First, there are microenvironmental factors such as pH. The relatively low pH in certain parts of the body prevents the growth of pathogens. For example, the following areas of the body have an acidic pH:
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