Understanding Antigen Presenting Cells and T Cells

The video explains the roles of antigen presenting cells, focusing on dendritic cells and B cells, which use MHC II complexes to present antigens. It also covers the function of MHC I complexes in nucleated cells, highlighting their role in identifying cancerous or virus-infected cells. The video further discusses how T cells, including helper and cytotoxic T cells, are activated and differentiate to respond to these antigens, emphasizing the immune system's ability to target and eliminate harmful cells.

What is the primary function of dendritic cells in the immune system?

• To produce antibodies

• To present antigens using MHC II complexes

• To destroy infected cells

• To transport oxygen

Which cells are responsible for presenting antigens using MHC II complexes?

• Antigen presenting cells

• Cytotoxic T cells

• Helper T cells

• Red blood cells

Which type of cells in the human body do not have a nucleus?

• B cells

• White blood cells

• Red blood cells

• Dendritic cells

What is the significance of MHC I complexes in cells?

• They produce antibodies

• They activate B cells

• They present internal proteins to cytotoxic T cells

• They help in oxygen transport

What triggers helper T cells to activate?

• Binding to MHC I complexes

• Detecting cancerous cells

• Binding to MHC II complexes

• Detecting free-floating viruses

What is the main difference between MHC I and MHC II complexes?

• MHC II activates cytotoxic T cells

• MHC II is found in all nucleated cells

• MHC I presents internal proteins, MHC II presents external antigens

• MHC I is found only in red blood cells

What is the role of cytotoxic T cells in the immune response?

• To produce antibodies

• To activate helper T cells

• To destroy infected or cancerous cells

• To present antigens

How do cytotoxic T cells induce cell death?

• By engulfing the cell

• By producing antibodies

• By binding to MHC II complexes

• By releasing perforins and granzymes

What happens when a B cell is activated?

• It produces cytotoxic T cells

• It starts producing antibodies

• It becomes a virus factory

• It presents antigens using MHC I

What is the role of memory cells in the immune response?

• To immediately destroy pathogens

• To remember past infections for faster response

• To produce antibodies continuously

• To activate helper T cells