Which of the following is considered your body's first line of Defence against infection?

Asked By: Yohanny Rolfer | Last Updated: 1st May, 2020
Category: medical health lung and respiratory health
4.1/5 (100 Views . 13 Votes)
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.

Click to see full answer


Simply so, what is the body's first line of defense against infection quizlet?

-the body's first line of defense against pathogens are barriers that trap and kill most pathogens with which you come into contact. The surfaces of the skin, breathing passages, mouth, and stomach function as these barriers.

Additionally, what is the first line of defense when you are breathing? Alveolar macrophages AMs, the resident mononuclear phagocytes of the lung, provide the first line of defence against organisms or particles reaching the lower airways. They must neutralise the invading pathogens or recruit neutrophils and other mononuclear cells.

Beside above, what is the body's first line of defense quizlet?

The first line of the defense is the surface barrier. Skin as a chemical and physical defense. Mucous membranes prevents epithelial cell entrance. What defenses serve as the body's second line of defense against invading pathogens?

What is the difference between the first and second lines of defense against invading pathogens?

There are three lines of defense: the first is to keep invaders out (through skin, mucus membranes, etc), the second line of defense consists of non-specific ways to defend against pathogens that have broken through the first line of defense (such as with inflammatory response and fever).

27 Related Question Answers Found

What is the body's second line of defense against pathogens?

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).

Which type of non specific immunity serves as the body's first line of defense?

Innate, or nonspecific, immunity is the defense system with which you were born. It protects you against all antigens. Innate immunity involves barriers that keep harmful materials from entering your body. These barriers form the first line of defense in the immune response.

What is one important effect of your body's ability to remember the characteristics of certain pathogens?

What is one important effect of your body's ability to "remember" the characteristics of certain pathogens? It prevents certain pathogens from making you sick more than once.

How do antigens work?

The invading microbe or pathogen is called an antigen. It is regarded as a threat by the immune system and is capable of stimulating an immune response. Antigens are proteins that are found on the surface of the pathogen. When an antigen enters the body, the immune system produces antibodies against it.

What do antibodies do?


Antibodies, also known as immunoglobulins, are Y-shaped proteins that are produced by the immune system to help stop intruders from harming the body. When an intruder enters the body, the immune system springs into action. These invaders, which are called antigens, can be viruses, bacteria, or other chemicals.

What is the outcome when the complement cascade is activated quizlet?

What are the 3 major outcomes of the complement cascade? Complement stimulates basophil and mast cell degranulation (histamine release --> redness, warmth, swelling and pain). C5a is also a chemokine, attracting cells of the immune system to the site of infection.

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

How do the lungs protect themselves?

The lungs have several ways of protecting them- selves from irritants. First, the nose acts as a filter when breathing in, preventing large particles of pollutants from entering the lungs. Cilia move mucus from the lungs upward toward the throat to the epiglottis.

What does the respiratory system protect?

The respiratory system protects itself from potentially harmful substances in the air by the mucociliary escalator. This includes mucus-producing cells, which trap particles and pathogens in the incoming air.

How can I protect my lungs from infection?


The best way to avoid lung infections is to keep your hands clean. Wash regularly with warm water and soap, and avoid touching your face as much as possible. Drink plenty of water and eat lots of fruits and vegetables — they contain nutrients that help boost your immune system. Stay up-to-date with your vaccinations.

How do lungs fight infection?

Lungs are delicate and exposed to the environment, almost like an open wound. It works like this: airway epithelial cells initiate an immune response to inhaled bacteria by signaling for white blood cells to move from the bloodstream into the lungs and airway to fight potential infection.

What line of defense is lysozyme?

The innate immune system of fish is considered to be the first line of defence against a broad spectrum of pathogens and is more important for fish as compared with mammals. Lysozyme level or activity is an important index of innate immunity of fish and is ubiquitous in its distribution among living organisms.

How does your respiratory system help fight disease?

Particles, such as dust and soot, mold, fungi, bacteria, and viruses deposit on airway and alveolar surfaces. Cilia propel a liquid layer of mucus that covers the airways. The mucus layer traps pathogens (potentially infectious microorganisms) and other particles, preventing them from reaching the lungs.

Are antibodies part of the first second or third line 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 are the body's three main lines of defense against antigens?


Immune System Lines of Defense. The immune system includes three lines of defense against foreign invaders: physical and chemical barriers, nonspecific resistance, and specific resistance. The first line of defense are the physical and chemical barriers, which are considered functions of innate immunity.

What are 3 lines of defense?

In the Three Lines of Defense model, management control is the first line of defense in risk management, the various risk control and compliance over- sight functions established by management are the second line of defense, and independent assurance is the third.

How does the human body protect itself from infection?

Defenses Against Infection. Natural barriers and the immune system defend the body against organisms that can cause infection. The immune system uses white blood cells and antibodies to identify and eliminate organisms that get through the body's natural barriers.