The Role of White Blood Cells in the Immune System

The video explains how the immune system uses white blood cells to combat disease. It covers the roles of phagocytes, which ingest pathogens, and lymphocytes, which produce antibodies specific to pathogens. The video also discusses the concept of antigens and how memory cells enable a faster immune response upon re-exposure to the same pathogen. The immune system's ability to prevent illness by destroying pathogens before symptoms arise is highlighted.

What are the main components of blood that play a role in the immune system?

• Plasma

• Red blood cells

• White blood cells

• Platelets

What is the primary function of phagocytes?

• To engulf and digest pathogens

• To produce antibodies

• To clot blood

• To transport oxygen

What are antibodies?

• Cells that engulf pathogens

• Proteins that attach to antigens

• Enzymes that digest food

• Hormones that regulate metabolism

How do lymphocytes recognize pathogens?

• By their shape

• By their antigens

• By their color

• By their size

What happens when a lymphocyte is activated by a pathogen?

• It releases digestive enzymes

• It divides to produce clones

• It engulfs the pathogen

• It changes color

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

• To produce digestive enzymes

• To remember pathogens for faster response

• To transport oxygen

• To secrete hormones

How does the secondary immune response differ from the primary response?

• It involves different types of cells

• It is faster and produces more antibodies

• It is slower and less effective

• It does not involve antibodies