OBJECTIVE LIFE SCIENCE
SIGNALLING IMMUNOLOGY CANCER
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Question
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Example of 3rd line of defense.
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T cells and B cells reacting to pathogens
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Phagocytes engulfing pathogens
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Hydrochloric acid killing pathogens
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Mucus and cilia catching pathogens
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Explanation:
Detailed explanation-1: -The third line of defense are the specific lymphocytes that produce antibodies as part of the adaptive immune response.
Detailed explanation-2: -Armed helper T cells that recognize the peptide:MHC complex then deliver activating signals to the B cell. Thus, protein antigens binding to B cells both provide a specific signal to the B cell by cross-linking its antigen receptors and allow the B cell to attract antigenspecific T-cell help.
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