Immune System Functions and Responses

The video explains how the immune system defends against infectious diseases. It describes the first line of defense, including skin and mucous membranes, and the second line involving phagocytes and endocytosis. The role of antigens and antibodies in recognizing and fighting pathogens is detailed, highlighting the immune system's ability to remember and respond to infections.

What is the primary role of the skin in the immune system?

• To produce antibodies

• To transport white blood cells

• To produce antigens

• To act as a barrier to infection

Which process allows phagocytes to engulf pathogens?

• Mitosis

• Photosynthesis

• Endocytosis

• Exocytosis

What is the function of lysosomes in the immune response?

• To break down unwanted material

• To secrete hormones

• To produce antibodies

• To transport oxygen

What are antigens?

• Proteins that bind to antibodies

• Foreign substances that stimulate antibody production

• Enzymes that digest pathogens

• Cells that produce antibodies

How do lymphocytes contribute to the immune response?

• By breaking down cell walls

• By producing antibodies

• By engulfing pathogens

• By producing antigens

What is the relationship between antibodies and antigens?

• Antibodies bind to specific antigens

• Antigens destroy antibodies

• Antigens are a type of antibody

• Antibodies are produced by antigens

Why is the lock-and-key mechanism important in the immune system?

• It allows antibodies to bind to any antigen

• It allows antigens to destroy antibodies

• It ensures antibodies bind to specific antigens

• It prevents antibodies from being produced

What happens when an antibody matches an antigen?

• The antigen becomes inactive

• A chain reaction occurs, producing more antibodies

• The antibody is destroyed

• The antigen is absorbed

How does the body remember pathogens for future defense?

• By storing antigens

• By producing memory cells

• By reducing antibody production

• By increasing white blood cell count

What is the role of lymphocytes in the immune memory process?

• They destroy antibodies

• They transport pathogens

• They produce antigens

• They create memory cells