What Is Body Defence Mechanism?

Your body has a two-line defence system against pathogens (germs) that make you sick.

Pathogens include bacteria, viruses, toxins, parasites and fungi.

These include your skin, tears, mucus, cilia, stomach acid, urine flow, ‘friendly’ bacteria and white blood cells called neutrophils.2 Nov 2010

What are the body defenses?

Natural barriers and the immune system defend the body against organisms that can cause infection. (See also Lines of Defense.) Natural barriers include the skin, mucous membranes, tears, earwax, mucus, and stomach acid. Also, the normal flow of urine washes out microorganisms that enter the urinary tract.

What are the body’s three defenses?

A castle has three lines of defense: First, A moat and drawbridge. The first line of defense in our bodies are physical and chemical barriers – our skin, stomach acids, mucus, tears, vaginal opening, of which the last three mostly produce lysozyme to destroy harmful incoming pathogens.

How does the body defend itself against infection?

The body also defends against infection by increasing the number of certain types of white blood cells (neutrophils and monocytes), which engulf and destroy invading microorganisms. The increase can occur within several hours, largely because white blood cells are released from the bone marrow, where they are made.

What is the 1st 2nd and 3rd line of defense?

These are three lines of defense, the first being outer barriers like skin, the second being non-specific immune cells like macrophages and dendritic cells, and the third line of defense being the specific immune system made of lymphocytes like B- and T-cells, which are activated mostly by dendritic cells, which 29 May 2017

Which line of defense is most important?

Physical Barriers

The skin is a very important barrier to pathogens. It is the body’s largest organ and the most important defense against disease.29 Feb 2012

What is the body’s 3rd line of defense?

The third line of defense is specific resistance. This system relies on antigens, which are specific substances found in foreign microbes. Most antigens are proteins that serve as the stimulus to produce an immune response. The term “antigen” comes from ANTI-body GENerating substances.

What is the body’s first line of 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.2 Nov 2010

What are the body’s innate defenses?

The innate defense consists of several elements: The skin and all mucous membranes in the body openings, which form external barriers. Different defense cells from the white blood cell group (leukocytes) Various substances in the blood and in body fluids.7 Dec 2010