Can I still hold this line of defense What are the three lines of defense of the individual

I support the point of view on the ground floor. I'm a very single-minded and conservative girl, I just broke up with my boyfriend, and I feel like I need to protect myself.

It's too long. I didn't finish it. Be a man with self-love.

Well, it's reasonable to say that love and sex should be separated.

I think if you don't like A, you have to make it clear. You have to make him have a long pain that is better than a short pain, don't feel that you can't say it, love is cruel, you have to cling to your true love ......

I hope you are happy.

I'm a boy! But I want you to believe in your principles! There are really very few girls like you now! I'm sure you'll find one of the kind of boys you want!

Give it to him the first time when you get married!

Be sure to choose, I want B. Because a so that you can dump his current girlfriend. In the future, it will be impossible to dump you for others.

The first line of defense is composed of ** and mucous membranes, which can not only block pathogens from entering the human body, but also their secretions (such as lactic acid, fatty acids, stomach acid and enzymes, etc.) have a bactericidal effect.

The second line of defense is germicidal substances in body fluids and phagocytes. These two lines of defense are the natural defense functions gradually established by human beings in the process of evolution, which are characterized by the fact that everyone is born with them, and they do not target a specific pathogen and have a defense effect against a variety of pathogens, so they are called non-specific immunity (also known as innate immunity).

The third line of defense is mainly composed of immune organs (thymus, lymph nodes, spleen, etc.) and immune cells (lymphocytes, a type of white blood cell). The third line of defense is the acquired defense function gradually established by the human body after birth, which is characterized by being produced after birth and only acts against a specific pathogen or foreign body, so it is called specific immunity (also known as acquired immunity).

The first line of defense is made up of the first line of defense of the human body's ** mucous membranes.

The second line of defense consisting of bactericidal substances in body fluids and phagocytes.

Specific immunity is the third line of defense.

The first - ** mucosa.

The second - phagocytic cells.

The third - immune, lymphatic.

High school textbooks say **. Non-specific immunity and specific immunity.

** Non-specific immunity.

Specific immunity.

In the first line of defense, the phagocyte's role is to destroy the antigen directly, while in the second line of defense, it processes the antigen, then presents it downward, and finally engulfs the antibody-treated antigen.

The second and third paths are all involved in phagocytes.

The effect is about the same, the second phagocytosis of antigens, and the third phagocytosis of anti-antigen and primary antibody complexes.

The second line is nonspecific and the third line is specific (phagocytosis facilitated by lymphocytes).

Third, phagocytic cells are immune cells, which mainly break down antigenic substances.

The second line is non-specific, and the third line is specific.

Encyclopedia on

The first line of defense.

They are not only able to block pathogens from invading the human body, but also their secretions (such as lactic acid, fatty acids, gastric acid and enzymes, etc.) also have a bactericidal effect. There are cilia on the mucous membranes of the respiratory tract that remove foreign bodies.

The first line of defense of the human body is the mucous membrane; Because there are three barriers on the ** and mucous membranes, physical barriers, chemical barriers, and biological barriers; The physical barrier, of course, means that ** and the mucous membrane are like a wall that can resist pathogenic microorganisms; Chemical barrier, that is, there are a lot of secretions on the surface of the mucosa, and these secretions have a good bactericidal and antibacterial effect; There are many non-pathogenic microorganisms on the surface of the biological barrier, that is, ** and mucous membranes, and those microorganisms also play a role in sterilization and bacteriostasis. This is the body's first line of defense.

The most important thing is saliva, gastric juice or something, not body fluids......

The reason why they are divided into three categories makes sense, the first step is not to let bad things into the body (entering the body means to the body fluids, only there can you attack human cells or something, the second step is to enter the body fluids, and then the body fluid guards come out to destroy them, it really can't enter the cells, and then use the third trick to find the cells with bad things, and destroy your cells before the virus uses your cells to multiply, this is the fundamental basis for classification So don't think that the sterilization in saliva is the second course just because there is a lysozyme or something written in the book).

The first line of defense - the defense system composed of the mucosa of the digestive tract, the mucosa of the respiratory tract, the mucosa of the genitourinary tract and the secretions on its surface. Saliva is in the mouth of the digestive tract and belongs to the first line of defense.

The second line of defense - the composition of bactericidal substances in body fluids (including blood, tissue fluids, and lymph), and the second and third lines of defense do not come into play until the pathogen breaks through the first line of defense.

The correct answer is the first line of defense.

The second line of defense is germicidal substances in body fluids and phagocytes.

These two lines of defense are the natural defense functions gradually established by human beings in the process of evolution, and the characteristic is that Liang Ze is born with them, not against a specific pathogen, and has an anti-rubber trap effect on a variety of pathogens, so it is called non-specific immunity (also known as innate immunity).

Natural killer cells and cytotoxic T cells.

Non-specific, everyone is born with it, not against a specific pathogen, but a variety of pathogens have a certain defensive effect.

Lymph nodes belong to the third line of defense. Immune organs (lymph nodes, etc.) and immune cells (lymphocytes, etc.) form the third line of defense.

Notes: ** and mucous membranes form the first line of defense, and bactericidal substances and phagocytes in body fluids constitute the second line of defense.

Don't listen to the, lymph nodes belong to the second line of defense.

The magician's answer was correct!

The first free of the human body.

The line of defense against the BAI epidemic is du**, mucous membrane; Because there are three barriers on the skin and mucous membranes, the physical barrier, the chemical barrier, and the biological barrier; The physical barrier, of course, means that ** and the mucous membrane are like a wall that can resist pathogenic microorganisms; Chemical barrier, that is, there are a lot of secretions on the surface of the mucosa, and these secretions have a good bactericidal and antibacterial effect; There are many non-pathogenic microorganisms on the surface of the biological barrier, that is, ** and mucous membranes, and those microorganisms also play a role in sterilization and bacteriostasis. This is the body's first line of defense.

The second line of defense of the human body is the bactericidal substances and phagocytes in body fluids, such as lysozyme, blood and tissues, organs contain sweat, gastric juice and saliva The main emphasis is not on whether it is a body fluid or not, but on the secretion of tears produced by mucous membranes.

All are non-specific immunizations.

The first line of defense is composed of ** and mucous membranes, etc., and the second line of defense is bactericidal substances and phagocytes in body fluids, all of which are non-specific immunity

** Non-specific immunity. It is characterized by innate immunity. Only the third line of defense is specific immunity.

Human beings are in a long evolutionary process. One line of defense against pathogens is formed. ** and mucous membranes are the first line of defense to protect the human body, they are not only able to block pathogens from invading the human body, but also their secretions, (such as lactic acid, fatty acids, stomach acid, and enzymes, etc.) also have a bactericidal effect.

There are cilia on the mucous membranes of the respiratory tract, which have the effect of clearing foreign bodies, including germs.

Bactericidal substances in body fluids and chewing cells are the second line of defense against the human body. The lysozyme in the bactericidal substance can destroy the cell wall of many kinds of bacteria and dissolve the bacteria. Swallowing cells distributed in the blood and tissues and organs (such as lymph nodes, spleen, liver, etc.) can invade the body's pathogens to swallow and digest.

The characteristics of the upper two lines of defense are born with human fever, which is not against a specific pathogen, but has a defensive effect against a variety of pathogens, so it is called [non-specific immunity].

The body's third line of defense is mainly composed of immune organs (thymus, lymph nodes and spleen) and immune cells. The acquired defense function gradually established by the human body after birth, which is characterized by being produced after birth, only acts on a specific pathogen or foreign body, so it is called [specific immunity] (also known as acquired immunity).

Innate immunity (non-specific immunity).