Understanding the Immune System

What is the primary role of the immune system?

• To protect the body from harmful invaders

• To produce energy

• To regulate body temperature

• To digest food

Which of the following is NOT a physical or chemical barrier in the first line of defense?

• Hydrochloric acid

• Skin

• Red blood cells

• Saliva

What is the function of lysozyme found in saliva?

• To neutralize stomach acid

• To trap pathogens in mucus

• To break down bacterial cell walls

• To digest proteins

What is the main characteristic of the innate immune response?

• It is a non-specific response

• It involves antibodies

• It only occurs in the digestive system

• It is specific to each pathogen

Which cells are primarily involved in phagocytosis?

• Red blood cells

• Phagocytes

• Helper T cells

• B cells

What is the role of the complement system in the innate immune response?

• To digest pathogens

• To produce antibodies

• To activate phagocytes

• To recruit white blood cells and trigger inflammation

What distinguishes the adaptive immune response from the innate immune response?

• It involves physical barriers

• It is faster

• It is specific to previously encountered pathogens

• It does not involve white blood cells

Which cells are responsible for antibody-mediated immunity?

• Cytotoxic T cells

• B cells

• Red blood cells

• Phagocytes

What is the function of cytotoxic T cells in the adaptive immune response?

• To digest food

• To secrete mucus

• To kill virus-infected cells

• To produce antibodies

What will the next video focus on according to the conclusion?

• The role of antibodies

• The structure of pathogens

• The function of T cells

• The function of B cells