Microbiology Chapter 25 – Flashcards
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| Neutrophils are the most abundant phagocytic cells. How do they differ from other phagocytic cells? |
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| They are common in pus and at the site of acute inflammation |
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| The most common circulating antibody is |
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| IgG |
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| What causes antibodies to be released into the bloodstream? |
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| When an antigen binds to the receptor of a B cell, it triggers the B cell to divide to produce plasma cells and memory B cells. The plasma cells release antibodies, which resemble the B cell receptor without the transmembrane portion and the portion that extends into the cytoplasm. This allows the antibodies to be released into the blood stream. |
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| How do T-cytotoxic cells function in our immune system? |
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| T cell receptors cause an adaptive immune response by |
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| only binding when antigens are attached to self proteins |
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| Substances that cause an immune system response are called |
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| immunogens |
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| What is phagocytosis? |
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| endocytosis of large particles |
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| Which of these immune system cells are phagocytes? |
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| neutrophils |
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| What does the plasma membrane of a phagocyte attach to on a microorganism? |
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| Glycoproteins |
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| The process by which a phagocyte moves toward a chemical signal at the site of an infection is called |
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| chemotaxis. |
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| Which of the following phagocytic processes occurs last in the sequence? |
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| Exocytosis |
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| What is the role of opsonins? |
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| They create "handles" that make it easier for the pseudopods of phagocytes to attach to the microbe invader. |
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| What is a phagolysosome? |
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| Which of the following is similar to lymph? |
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| blood plasma without red blood cells |
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| Which of the following is not a function of the lymphatic system? |
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| Digestion of carbohydrates |
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| Which of the following is an example of a barrier defense that forms part of the innate immunity of vertebrates? |
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| Acidity in the stomach kills many microbes. |
