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Innate Immunity quiz #1

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  • What are the main physical and chemical barriers involved in the innate immune system, and how do they function to prevent pathogen entry?
    The main physical barrier is the skin, which acts as a protective layer to block pathogen entry. Chemical barriers include mucus, which traps pathogens at body openings, and lysozymes, enzymes that break down bacterial cell walls. Mucus may also contain antimicrobial enzymes that kill trapped invaders.
  • How do pattern recognition receptors (PRRs), such as Toll-like receptors, contribute to the innate immune response?
    PRRs, including Toll-like receptors (TLRs), are membrane proteins on immune cells that recognize pathogen-associated molecular patterns (PAMPs) found on pathogens. When TLRs bind to PAMPs, they trigger signaling cascades that lead to the release of cytokines, recruiting more immune cells and initiating an immune response.
  • Describe the process of phagocytosis in the innate immune system and identify the main types of phagocytic cells involved.
    Phagocytosis is the process by which phagocytic cells engulf and digest pathogens. The main phagocytic cells in the innate immune system are neutrophils, which circulate in the blood and respond to infection sites, and macrophages, which reside in tissues and organs. Dendritic cells also perform phagocytosis and help activate the adaptive immune system.
  • What is the role of the complement system in innate immunity?
    The complement system consists of proteins in the blood that are activated by pathogen-associated molecular patterns. Once activated, these proteins form pores in pathogen membranes, causing cell lysis and enhancing the overall immune defense.
  • What are the main physical and chemical barriers of the innate immune system, and how do they prevent pathogen entry?
    The main physical barrier is the skin, which blocks pathogen entry, while chemical barriers include mucus that traps pathogens and lysozymes that break down bacterial cell walls.
  • How do pattern recognition receptors (PRRs), such as Toll-like receptors, contribute to the innate immune response?
    PRRs like Toll-like receptors recognize pathogen-associated molecular patterns (PAMPs) on pathogens and trigger signaling cascades that release cytokines, recruiting more immune cells to initiate an immune response.
  • Describe the process of phagocytosis in the innate immune system and name the main types of phagocytic cells involved.
    Phagocytosis is when phagocytic cells engulf and digest pathogens; the main phagocytic cells are neutrophils, macrophages, and dendritic cells.
  • What is the role of the complement system in innate immunity?
    The complement system consists of blood proteins that, when activated by PAMPs, form pores in pathogen membranes, causing cell lysis and enhancing immune defense.
  • What is the function of cytokines during the innate immune response?
    Cytokines are signaling molecules released by immune cells that attract and recruit other immune cells to the site of infection, amplifying the immune response.
  • How does the inflammatory response help protect the body after tissue injury?
    The inflammatory response causes swelling and recruits immune cells to the injury site through the release of chemokines and histamine, helping to contain and eliminate pathogens.