PATHOLOGY MCQ
IMMUNE RESPONSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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Detailed explanation-1: -The third line of defence is called the immune response and is SPECIFIC. It involves the production of two types of lymphocytes (B and T cells) which are specific to the invading particle. They work together to attack the pathogen.
Detailed explanation-2: -What is the body’s third line of defence against pathogens? The third level of your immune system consists of cells tailor-made to get rid of the specific microorganisms that have invaded your tissue. Special cells called dendritic cells are the liaison (point of communication) between innate and adaptive immunity.
Detailed explanation-3: -The third line of defense are the specific lymphocytes that produce antibodies as part of the adaptive immune response.
Detailed explanation-4: -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.