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Endotoxin Causes Damage to the Host quiz

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  • What is another name for endotoxin found in gram-negative bacteria?
    Endotoxin is also known as lipopolysaccharide or LPS.
  • Where is lipopolysaccharide (LPS) located in gram-negative bacteria?
    LPS is found in the outer membrane of gram-negative bacterial cells.
  • Which component of LPS is responsible for its toxic effects?
    The lipid A region of LPS is the toxic component responsible for damaging effects.
  • What triggers the release of lipid A from gram-negative bacteria?
    Lipid A is released during bacterial cell lysis or rupture.
  • What are the three main structural regions of LPS?
    LPS consists of the O antigen region, the core polysaccharide, and the lipid A region.
  • Which region of LPS varies among different strains of gram-negative bacteria?
    The O antigen region varies among different strains and species.
  • What is septic shock and how is it related to lipid A?
    Septic shock is a severe systemic response caused by lipid A entering the bloodstream, leading to widespread inflammation and organ dysfunction.
  • List three symptoms of septic shock caused by lipid A.
    Symptoms include fever, anemia (low red blood cell count), and weakness.
  • What is a cytokine storm and how does lipid A contribute to it?
    A cytokine storm is a massive release of cytokines during immune responses, which can be triggered by lipid A.
  • How does a cytokine storm affect blood vessels and blood pressure?
    It causes rapid dilation of blood vessels, leading to a significant decrease in blood pressure.
  • Which major organs can be affected by septic shock due to lipid A?
    The brain, kidneys, liver, and heart can all be affected by septic shock.
  • Why is septic shock considered life-threatening?
    Septic shock can cause irreversible organ damage and often leads to death if not controlled.
  • How does the core polysaccharide region of LPS differ from the O antigen region?
    The core polysaccharide remains relatively consistent, while the O antigen region varies among strains.
  • What happens if gram-negative bacteria infect the bloodstream and are lysed?
    Lipid A is released into the bloodstream, potentially causing septic shock and multi-organ failure.
  • What is the primary role of cytokines during an immune response?
    Cytokines act as communication signals between immune cells during immune responses.