Immune System

The video explores the immune system, highlighting its three lines of defense: the non-specific 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 long-term immunity is also discussed.

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

• To produce antibodies

• To act as a first line of defense

• To destroy infected cells

• To release histamine

Which substance is released by mast cells during an inflammatory response?

• Antigens

• Histamine

• Perforin

• Antibodies

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

• To destroy infected cells

• To produce antibodies

• To release histamine

• To act as a first line of defense

How do antibodies help in the immune response?

• By acting as a first line of defense

• By destroying infected cells

• By binding to antigens and deactivating pathogens

• By producing histamine

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

• To produce antibodies

• To stimulate B cells and cytotoxic T cells

• To release histamine

• To act as a first line of defense

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

• They help in launching a quick response upon re-exposure to a pathogen

• They act as a first line of defense

• They produce histamine

• They destroy infected cells

How do vaccines contribute to immunity?

• By introducing active pathogens

• By causing the disease

• By destroying infected cells

• By creating memory immune cells without causing the disease