Specific defense

What is an example of a specific defense? What are the characteristics of specific defenses? The immune system is the third line of defense. It consists of mechanisms and agents that target specific antigens (Ags).

An antigen is any molecule, usually a protein or polysaccharide, that can be identified as foreign (nonself) or self (such as MHC antigens described below).

Start studying Specific Defense. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Specific defense mechanism is the ability of the body to develop immunity against specific pathogens, toxins or foreign things.

Specific immune responses can distinguish among different invaders. The response is different for each invader. With nonspecific defenses, the protection is always the same, no matter what the invader may be.

Whereas only vertebrates have specific immune responses, all animals have some type of nonspecific defense.

The body possesses many mechanisms that impart nonspecific defense. The objectives of these mechanisms are to prevent microorganisms from gaining a foothold in the body and to destroy them if they penetrate to the deeper tissues. Most viral infections are limited by nonspecific defenses, which (1) restrict initial virus multiplication to manageable levels, (2) initiate recovery from established infections that is then completed by a combination of these early nonspecific and subsequent antigen- specific immune defenses, and (3) enable the host to cope with the peak numbers of virus that, if presented as the infecting. First recorded by the Greek historian Thucydides, who noticed that a person getting a disease and recovering would never catch the same disease again. It is very important to understand that this non- specific immune response is so formidable that only a minute amount of infections penetrates this first line of defense.

Skin is the first barrier and the first mechanism of non- specific defense. Cells such as macrophages, natural killer cells, monocytes, neutrophils, mast cells, and dendritic cells serve as phagocytes, which destroy the pathogens inside tissues. It is also called as innate immunity (Fig. 2).

Plants and many lower animals rely only on innate immunity and do not possess the second category of specific defense mechanisms. Non­ specific defense mechanisms work against a wide variety of invaders. The specific defense system, more commonly the immune system, is the second type of defense system within the body. The skin in particular is the primary line of defense being that it prevents pathogens from entering the body.

The skin is aided by chemical protectors such as sweat and oils that further kill and remove pathogens that may be present. Thus, the specific defense system is known as a functional system, as opposed to an. Your defense system starts with non- specific immunity, also known as innate immunity.

Non- Specific Immunity.

O157:H7- the specific defense your body builds up against this strain would not be effective against a different type of bacteria or virus. Specific Defense braingenie. This system is comprised of. Unsubscribe from braingenie? Frank Lectures 11views.

Apoptosis is a process of programmed cell death involving a cascade of specific cellular events leading to the death and destruction of the cell. Defense by B cells is called antibody-mediated immunity because the various types of B cells produce antibodies.