OVERVIEW OF THE IMMUNE SYSTEM
THE GOOD BAD AND UGLY OF THE IMMUNE SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Chemical Barriers
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Skin
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Interferon
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Component Proteins
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Detailed explanation-1: -The complement proteins C3b and to a lesser extent, C4b can function as opsonins, that is, they can attach antigens to phagocytes. The complement proteins C5b6789n, functions as a Membrane Attack Complex (MAC) causing lysis of Gram-negative bacteria, human cells displaying foreign epitopes, and viral envelopes.
Detailed explanation-2: -The major proteins of the immune system are predominantly cytokines (a type of hormone responsible for communication between cells of the immune system), antibodies (immunoglobulins), and complement proteins.
Detailed explanation-3: -C3b is best known for its opsonizing activity because when it coats the microbe, phagocytosis activity is increased.
Detailed explanation-4: -These are covered by nine central components of the cascade (C1 to C9), multiple activation products (such as C3a and C3b), regulators and inhibitors (e.g. Factor H and C4BP), proteases and newly assembled enzymes (e.g. C4b2a and Factor B), or effector molecule receptors (such as C3aR and C5aR) (Tables 1–3).