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Anonymous users2024-02-11Cellular immunity has a process, including induction, reaction, effect, etc., which is initiated after the antigen invades the body, that is, it begins to play a role. As for the host cell that did not invade later, it was only the third stage that did not continue, and the corresponding memory cells were produced so that the body had immunity, and there was no problem of waste.
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Anonymous users2024-02-10Antigens are antigens only when they invade the host Either they are called foreign bodies But it is also the removal of cellular immunity What does it mean that cellular immunity is prematurely activated Cellular immunity ignores it Clears its own aging Cancerous cells are cellular immunity.
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Anonymous users2024-02-09If it does not invade the host cell later, isn't it wasted if the cellular immunity is activated too early?
Be prepared.
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Anonymous users2024-02-08Another function of cellular immunity is that sensitized T cells can secrete lymphokines to promote the proliferation and differentiation of B cells. The two immunities are synergistic, how can it be wasted?
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Anonymous users2024-02-07The question you asked wasn't quite right at the beginning! The antigen belongs to the dormitory and survives! That is to say, after the antigen enters the body, it finds the host! And the antigen enters the body through the cell! So you seem to be asking a bit of a problem!
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Anonymous users2024-02-06Cellular immunity and humoral immunity are closely related, T lymphocytes, which play a major role in cellular immunity, play a connecting role in humoral immunity, which can present antigens to B lymphocytes and make B lymphocytes, which play a major role in humoral immunity, play a role
The antigens eventually released after cellular immunity still require humoral immunity to destroy".
This statement is true because the main role of cellular immunity is to release antigens in the host, and the immune factors released by cellular immunity can enhance humoral immunity.
The teacher's words should be thoughtful, but the best teacher is not only interested in books, but the content of books must be understood.
Humoral immunity precedes cellular immunity:
When the antigenic substance enters the cell, humoral immunity is carried out first, and if the humoral immunity cannot be eliminated, it is the turn of cellular immunity. Although T cells deliver a portion of antigen to humoral immunity during humoral immunity, T cells do not play a role in cellular immunity, which is the process of lysing host cells. Hence humoral immunity precedes cellular immunity.
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Anonymous users2024-02-05The main body of cellular immunity is T lymphocytes, and the mechanism of action includes two aspects:
1.Direct killing of sensitized T cells (effector T cells).
2.Through lymphokines, they cooperate with each other and synergistically kill target cells.
The main body of humoral immunity is B lymphocytes, and the action is divided into three steps:
Cells produce plasma cells and memory cells.
2.Plasma cells produce antibodies.
3.Memory cells and secondary immune responses.
Humoral immunity is a type of immunity carried out by immunoglobulins in body fluidsCellular immunity is a kind of immunity directly participated by T cells, so humoral immunity responds quickly, while cellular immunity is slow.
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Anonymous users2024-02-04High school creatures don't seem to have neuroimmunity.
Cellular immunity is the lysis of target cells by effector T cells in direct contact with them.
Humoral immunity binds to antigens through plasma cell secretion of antibodies.
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Anonymous users2024-02-03Haven't you heard of neuroimmunity? Humoral immunity is to bind to antigens through antibodies produced by plasma cells to achieve the effect of clearing antigens, because antibodies are mainly distributed in serum and tissue fluid (antibodies for allergic reactions are distributed on the surface of some cells), so it is humoral immunity; Cellular immunity is the binding of effector T cells to induce the lysis and death of target cells, and the objects of effector T cells are cells (target cells) - cells infected by antigens (cells containing intracellular parasites and viruses), cancer cells, and tissue cells of transplanted organs.
** and mucous membranes belong to the first line of defense of the human body to protect themselves, phagocytic cells and lysozyme belong to the second line of defense, immune cells and immunoactive substances, immune organs belong to the third line of defense of the human body, the first two are called non-specific immunity, the third is called specific immunity, and phagocytic cells play an important role in the recognition of antigens by specific immunity, so they also belong to specific immunity, the two mechanisms of specific immunity, namely cellular immunity and humoral immunity, when pathogenic microorganisms break through the first and second lines of defense, Specific immunity is activated, that is, when the first two lines of defense do not effectively prevent the invasion of pathogenic microorganisms, specific immunity comes into play.
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Metaphase chromosomes are neatly arranged on the equatorial plate.
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