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Cytokines such as interferrons and interleukins are secreted by the T cell in response to antigen. These chemicals are also secreted by B cells, dendrictic cells and natural killer cells.

These chemicals are signalling agents that modulate (or properly control) the immune response

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Q: What chemicals secreted by t cells in response to antigens?
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Which chemicals are secreted by T-helper cells to stimulate b-plasma cells to divide?

These chemicals are called CYTOKINES.

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Antigens! I have this exact question for health!

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They have receptors lining their membrane which aid in locating sources of antigens by the chemicals they release.

What is acquired Immune Response?

The acquired immune response is also known as the specific immune response. This involves the presentation of micro organisms antigens by macrophages to T and B lymphocytes (T and B cells). T cells and B cells specific to these antigens will then go through clonal expansion (mass production) to help carry out a specific response that has been 'acquired' as a direct result or particular microorganisms antigens. T cells are divided into T helper and T killer, and B cells into memory cells and plasma cells. T helper cells aid B cells in their production and carrying out their functions. T killer cells kill infected cells (those containing viruses or bacteria, as detected by their presentation of antigen on MHC Class 1 receptor molecules on their surface). B cells differentiate into plasma cells and memory cells, plasma cells produce antibodies specific to the type or types of antigens detected. Memory cells have the ability to live for long amounts of time and quickly differentiate into plasma cells should the same antigens present at a later date, allowing a faster and more efficient immune response if infected again with the same microorganism. The acquired immune response usually takes 7-10 days after initial presentation of the antigens by macrophages - unless this is a secondary response, in which case the person should have already produced memory cells so can deal with the invading microorganisms faster and more efficiently. The innate (passive) immune system is responsible for initial responses, this is non specific and involves neutrophils largely.

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Processed fragments of protein antigens displayed on surfaces of body cells.

How are the roles of b and t cells different how are their roles similar?

Both are T and B lymphocytes are produced in bone marrow, but B lymphocytes mature in bone marrow and are part of the humoral response, while T lymphocytes mature in the thymus gland and are part of the cell mediated response.

What prevents some bacterial diseases?

You're innate and adaptive immune system. Basically - your innate system senses the presence of invader bacterial intruders and dendritic cells engulf them and then present them to B and T cells in your lymph nodes triggering a specific adaptive immune response. -B cells produce secreted antigens called antibodies that can bind to the toxins that the pathogenic bacteria produce and thus prevent disease and kill the bacteria. -There are bacteria and virus' that can evade this response. Some hide within our own cells ... a good example of this is HIV (virus).