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Cell Communication: Surface Receptors & Adhesion Molecules quiz

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  • What are cell surface receptors and what is their main function?
    Cell surface receptors are proteins on the cell membrane that allow cells to sense and respond to external signals.
  • What is a ligand in the context of cell communication?
    A ligand is a specific molecule that binds to a cell surface receptor and triggers a cellular response.
  • How do cell surface receptors contribute to immunity?
    They enable immune cells to detect signals of infection and respond appropriately by triggering internal cellular responses.
  • Can cells change the number and types of surface receptors they have?
    Yes, cells can alter the number and types of surface receptors to adjust their sensitivity and response rate to ligands.
  • What happens when a ligand binds to its specific cell surface receptor?
    Binding triggers a cascade of events inside the cell, leading to a cellular response to the external signal.
  • What are adhesion molecules and what is their primary role?
    Adhesion molecules are cell surface proteins that enable cells to bind to other cells, crucial for immune cell migration.
  • How do adhesion molecules help immune cells during an infection?
    They allow immune cells to bind to endothelial cells lining blood vessels, facilitating migration into infected tissues.
  • What is the significance of adhesion molecules in cell communication?
    Adhesion molecules are important for cell communication by enabling direct binding and delivery of signaling molecules between cells.
  • What is the function of endothelial cells in relation to adhesion molecules?
    Endothelial cells lining blood vessels produce adhesion molecules that help immune cells bind and migrate into tissues.
  • How does the interaction between adhesion molecules on immune and endothelial cells affect immune cell movement?
    This interaction slows down immune cells, allowing them to exit the blood and enter tissues to combat infection.
  • Why are both cell surface receptors and adhesion molecules integral to the immune system?
    They are essential for detecting infections and enabling immune cells to respond and migrate to infected areas.
  • What is the difference between cell surface receptors and adhesion molecules?
    Cell surface receptors detect and respond to external signals, while adhesion molecules facilitate cell binding and migration.
  • How do immune cells use adhesion molecules to deliver signals?
    Immune cells can attach to other cells via adhesion molecules and directly deliver signaling molecules to them.
  • What role do adhesion molecules play in the migration of immune cells?
    They enable immune cells to bind to blood vessel walls and migrate into tissues where infection is present.
  • How does cell communication via surface receptors and adhesion molecules relate to innate immunity?
    These mechanisms act as 'security cameras,' helping the immune system detect and respond to signs of microbial infection.