What are the lines of defense against infection?

The immune system’s three lines of defense include physical and chemical barriers, non-specific innate responses, and specific adaptive responses.

What are the 4 first line of defense against infection?

The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection.

What are the body’s 3 lines of defense?

The immune system includes three lines of defense against foreign invaders: physical and chemical barriers, nonspecific resistance, and specific resistance.

What is the first line of defense against infection?

The first line of defence is your innate immune system. Level one of this system consists of physical barriers like your skin and the mucosal lining in your respiratory tract. The tears, sweat, saliva and mucous produced by the skin and mucosal lining are part of that physical barrier, too.

What is the second line of Defence called?

The second line of defence is a group of cells, tissues and organs that work together to protect the body. This is the immune system.

What is the second line of defense in the immune system?

The second line of defense is nonspecific resistance that destroys invaders in a generalized way without targeting specific individuals: Phagocytic cells ingest and destroy all microbes that pass into body tissues. For example macrophages are cells derived from monocytes (a type of white blood cell).

What is second line of Defence?

What is line of physical defense?

The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, ‘friendly’ bacteria and white blood cells called neutrophils.

Is fever second line of defense?

For example, it can trigger an increase in core body temperature to produce a fever. This can help fight a range of different pathogens by making it too hot for them to survive. Such general responses to infection make up the second line of defence.

How is the third line of defense different than the first and second lines of defense?

The second line of defense are the non-specific phagocytes and other internal mechanisms that comprise innate immunity. The third line of defense are the specific lymphocytes that produce antibodies as part of the adaptive immune response.

What happens in the third line of defense?

The third line of defence is called the immune response and is SPECIFIC. It involves the production of two types of lymphocytes (B and T cells) which are specific to the invading particle. They work together to attack the pathogen.

What is the bodies first line of defense against infection?

The innate immune system is the body’s first line of defense against viral and other infections. Leukocytes are an important component of blood and a key player in the body’s immune system.

What are all the first line defenses against germs?

Skin: Your skin is the first line of defense against germs or toxins.

What is your first line of defense against pathogens?

First line of defense. The first line of body’s defense against pathogens starts with its passive barriers: skin, stomach acid, mucous membranes and endothelial tissues that are physical obstruction to pathogens’ advance and/or inhospitable for their survival due to their acidity, alkalinity or temperature.

What is the first line of defense against disease?

First Line of Defense. The primary defence against infectious disease are the surface barriers that prevent pathogens from entering the body. These surface barriers include intact skin (protect external boundaries) and mucous membranes (protect internal boundaries)