Quick Answer: What Are The Body’S Specific Defenses?

What are the four general characteristics of specific defenses?

Terms in this set (15)The four general characteristics of specific defenses include.


Cellular immune response.

– Cytotoxic T cells (aka CD8, MHC I dependent): Recognize and kill altered self-cells.

Tc Cells: …

Th cells: …

Antibody-Mediated immunity.

Active immunity.

Passive immunity.

Active: Gets sick, then better.More items….

Why do we need specific defenses?

The non-specific defenses, such as the skin and mucous membranes, prevent microorganisms from entering the body. The specific defenses are activated when microorganisms evade the non-specific defenses and invade the body. The human body is constantly bombarded with microorganisms, many of which can cause disease.

What is the primary difference between the specific and non specific defenses in the human body?

Immunity from disease is actually conferred by two cooperative defense systems, called nonspecific, innate immunity and specific, acquired immunity. Nonspecific protective mechanisms repel all microorganisms equally, while the specific immune responses are tailored to particular types of invaders.

What are the body’s specific defenses against pathogens?

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 specific defenses?

Specific defense: the adaptive immune system. … The immune system responds to antigens by producing cells that directly attack the pathogen, or by producing special proteins called antibodies. Antibodies attach to an antigen and attract cells that will engulf and destroy the pathogen.

What are four characteristics of the specific immune system?

There are four characteristics of adaptive immunity: antigenic specificity, diversity, immunologic memory and ability to distinguish between self and non-self. An immune response involves Lymphocytes (B-cells and T-cells) and antigen presenting cells (macrophages, B-cells, and dendritic cells).

What is the four characteristics of specific immunity?

One characteristic of specific immunity is recognition. Immune responses begin when the body recognizes the invader as foreign. This occurs because there are molecules on foreign cells that are different from molecules on the body’s cells. Molecules that start immune responses are called antigens .

What is non specific immune system?

A non-specific immune cell is an immune cell (such as a macrophage, neutrophil, or dendritic cell) that responds to many antigens, not just one antigen. … The cells of the innate immune system do not have specific responses and respond to each foreign invader using the same mechanism.

What is an example of specific immunity?

For example, an individual who recovers from a first case of the measles is immune to further infection by the measles-causing virus, because the virus stimulates the immune system to produce antibodies that specifically recognize and neutralize the pathogen the next time it is encountered.

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

The first line of defense are the physical and chemical barriers, which are considered functions of innate immunity. … The third line of defense is specific resistance, which is considered a function of acquired immunity.

What are the two components of the specific defense system?

There are two types of specific defense. These include cell-mediated immunity and antibody-mediated immunity. Cell-mediated immunity occurs when T-lymphocytes (T-cells) become activated by exposure to pathogens. Activated T-cells then attack pathogens directly.

What is specific acquired immunity?

Acquired immunity is also called specific immunity because it tailors its attack to a specific antigen previously encountered. Its hallmarks are its ability to learn, adapt, and remember. Acquired immunity takes time to develop after first exposure to a new antigen.

What four nonspecific defenses are caused by pathogens invading the body?

Nonspecific defenses include anatomic barriers, inhibitors, phagocytosis, fever, inflammation, and IFN. Specific defenses include antibody (more…)

What are specific host defenses of the body?

Host defenses that protect against infection include. Natural barriers (eg, skin, mucous membranes) Nonspecific immune responses (eg, phagocytic cells [neutrophils, macrophages] and their products) Specific immune responses (eg, antibodies, lymphocytes)

Which line of defense is most important?

The third line of defense is most important because it involves the cells and proteins of adaptive immunity, responding directly to specific antigens. All three lines of defense depend on each other to function properly and no single line is more important than the other.

What are the two types of specific immunity?

LEVELS OF IMMUNE SYSTEM The human specific immune system is a two level or DUAL SYSTEM consisting of soluble antibodies and special immune cells. The two systems work intimately as a coordinated unit.

What are 5 examples of nonspecific immunity?

NON SPECIFIC DEFENSES: Skin and Mucous membranes, antimicrobial chemicals, natural killer cells, phagocytosis, inflammation and fever.

What are the two main arms of the immune system?

In vertebrates, the immune system consists of two arms, a non-specific, innate arm and a more specific, acquired arm (Male and Roitt, 2000; Doan et al., 2005). The innate immune system provides initial protection to a wide variety of foreign organisms.