Immune System Function and Response

The video explores the immune system, highlighting its three lines of defense: the nonspecific first line (skin and mucous membranes), the second line (inflammatory response and complement system), and the specific third line (adaptive immunity). It details cell-mediated and humoral responses, emphasizing the roles of cytotoxic T cells and B cells. The importance of memory cells and vaccines in providing long-term immunity is also discussed.

What is the primary function of the immune system?

• To digest food

• To produce energy

• To protect the body from pathogens

• To regulate body temperature

Which of the following is considered the body's first line of defense against pathogens?

• White blood cells

• Antibodies

• Vaccines

• Skin and mucous membranes

What role does histamine play in the inflammatory response?

• It narrows blood vessels

• It dilates and makes blood vessels leakier

• It produces antibodies

• It destroys pathogens directly

Which cells are primarily responsible for consuming pathogens during the inflammatory response?

• Cytotoxic T cells

• Macrophages

• B cells

• Helper T cells

What is the main characteristic of adaptive immunity?

• It involves skin and mucous membranes

• It is the first line of defense

• It targets specific antigens

• It is nonspecific

How do cytotoxic T cells destroy infected cells?

• By producing antibodies

• By releasing histamine

• By causing apoptosis

• By consuming pathogens

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

• They consume pathogens

• They form the first line of defense

• They produce antibodies

• They help activate B cells and cytotoxic T cells

What is the function of antibodies in the humoral response?

• To consume pathogens

• To bind and neutralize antigens

• To produce histamine

• To stimulate cytotoxic T cells

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

• They consume pathogens

• They are part of the first line of defense

• They provide long-term immunity

• They produce histamine

How do vaccines contribute to immunity?

• By causing disease

• By introducing a strong pathogen

• By stimulating an immune response without causing disease

• By destroying all pathogens