Adaptive/specific immune responses, such as those induced by nasty infections such as Covid-19 and influenza ,involve antigen-specific T and/or B cells.
Added by Rodrigo O.
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The immune system is divided into two main components: the innate immune response, which provides immediate but non-specific defense, and the adaptive immune response, which is specific to particular pathogens. Show more…
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Immune Response Model The immune system is powerful because of its specificity (cells attack specific invaders) and its memory (cells are ready to launch a rapid attack if the same type of invader returns again). When a foreign cell enters the human body, the intruder begins to multiply and diffuse through the bloodstream. Each foreign cell has its own specific antigens. An antigen is a large molecule with a distinct configuration that triggers an immune response. Helper T cells, a specific type of white blood cells, roam around the human body, looking for foreign antigens. Once a helper T cell recognizes a foreign antigen, it activates B cells, another type of white blood cells, that begin to proliferate rapidly. The proliferation of white blood cells is activated when helper T cells come into contact with antigens. Foreign cells multiply rapidly. The strength of the immune response reflects the fraction of antigens that are detected by helper T cells. As the number of antigens grows, more antigens are detected, and the white blood cells proliferate more rapidly. Increasing proliferation is the source of the positive loop that drives the growth of the white blood cells. A negative loop comes into play as the white blood cells perform their duty and destroy foreign cells. As the number of white blood cells grows exponentially, antibodies or killer T cells are produced, and the number of foreign cells is drastically reduced. The immune response senses the absence of foreign cells. Helper T cells come into contact with fewer and fewer antigens, and white blood cell proliferation drops off, leaving the body with a good number of white blood cells ready to fend off a second possible invasion.
Shaiju T.
Adaptive Immunity differs from the innate immune system in its ability to respond to specific pathogen antigens. The antigens trigger antibody-mediated immunity, cell-mediated immunity, or both antibody-mediated immunity and cell-mediated immunity.
Madhur L.
T cells The term in reference to the immune system refers to the differentiation of self from non-self and the tailoring of the response to the particular foreign invader. nonspecific response Another key feature of the adaptive immune system is, and this feature of the adaptive immune system is maintained by a subset of B and T cells. innate B cells When the adaptive immune system is first activated, memory of the antibody-mediated immunity pathway is held in reserve and not used in the first response to the antigen. specific response Memory is also produced by the cell-mediated immunity pathway and will be stored for future exposure. Toxic cells adaptive can survive for years in the body and remain ready to respond rapidly and efficiently to a subsequent encounter with a pathogen. lymphocytes This is useful because if exposed to the same pathogen again, the pathogen is met immediately with a stronger, faster, more efficient response that usually effectively stops the infection with less reliance on the system. memory Memory cells incoherence Reset
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