Immune System Insights: Unraveling the Body's Defense Mechanisms

The video provides an overview of 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 explains the roles of cytotoxic T cells in cell-mediated response and B cells in humoral response. The importance of memory cells and vaccines in providing long-term immunity is also discussed.

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

• To produce histamine

• To act as a first line of defense

• To produce antibodies

• To destroy infected cells

Which cells release histamine during the inflammatory response?

• B cells

• Mast cells

• T cells

• Red blood cells

What is the main function of the complement system?

• To produce antigens

• To destroy red blood cells

• To complement the actions of the immune system

• To produce antibodies

What is an antigen?

• A substance recognized as foreign by the immune system

• A protein that binds to pathogens

• A type of antibody

• A type of white blood cell

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

• To destroy infected cells

• To produce antibodies

• To act as a first line of defense

• To release histamine

How do cytotoxic T cells destroy infected cells?

• By releasing histamine

• By producing antigens

• By causing apoptosis

• By releasing antibodies

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

• To produce antibodies

• To act as a first line of defense

• To destroy infected cells

• To release histamine

What shape do antibodies typically have?

• X shape

• O shape

• Z shape

• Y shape

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

• To produce antigens

• To destroy red blood cells

• To remember past infections

• To produce histamine

How do vaccines help in building immunity?

• By destroying red blood cells

• By introducing a strong pathogen

• By causing disease

• By introducing a weakened or inactive pathogen