Immune System: Helper T Cells Quiz

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16 Questions

What is the primary response to exposure to antigens in the context of acquired immunity?

Initiation of antibody development or T lymphocyte synthesis

Why do bacteria or viruses only cause one episode of a particular disease according to the text?

As a result of the presence of disease-specific antibodies in memory

What is the characteristic of bacteria and influenza viruses mentioned in the text?

They mutate and change over time requiring new vaccines

When is active immunity formed according to the text?

When antibodies or T cells are produced due to antigen exposure

What is the role of the skin and mucosa in the human body's defense mechanism?

Helping the body recognize and destroy microbes quickly

What is the function of lymphoid tissue in the immune system?

Filtering and trapping microbes

What is the main function of lymphocytes in the immune system?

Recognizing and destroying microbes quickly

What is the significance of acquired immunity in the human body?

It maintains a record of defeated germs for rapid response

What is the main function of Helper T cells?

Activating B cells and killer T cells

How are Helper T cells activated?

Through antigen presentation by phagocytes

What is the main role of Killer T cells in the immune system?

Attacking infected body cells

What do plasma cells produce?


What is the main function of the complement system?

Activating the immune system to produce antibodies

What is the role of antigens in the immune system?

Stimulating specific responses following exposure to foreign substances

What is the function of macrophages in the immune system?

Finding and 'eating' particles like bacteria and viruses

What is the purpose of the specific adaptive response in the immune system?

Identifying specific invaders and forming a specific response

Study Notes

Acquired Immunity

  • Exposure to antigens triggers a primary response, leading to the activation of immune cells and the production of antibodies.

Immunity to Disease

  • Bacteria or viruses can only cause one episode of a particular disease because the immune system remembers the pathogen and mounts a specific response to eliminate it.

Characteristics of Bacteria and Influenza Viruses

  • Bacteria have cell walls and can cause infection.
  • Influenza viruses are highly mutable and can change their surface antigens, making it difficult for the immune system to recognize them.

Active Immunity

  • Active immunity is formed when the body mounts a specific response to a pathogen, such as through vaccination or infection.

Skin and Mucosa Defense

  • The skin and mucosa act as barriers to prevent pathogen entry into the body.

Lymphoid Tissue

  • Lymphoid tissue, such as lymph nodes and spleen, filters out pathogens and activates immune responses.


  • Lymphocytes, such as T cells and B cells, recognize and respond to specific pathogens.

Acquired Immunity Significance

  • Acquired immunity provides long-term protection against specific pathogens, allowing the body to remember and respond to future infections.

Helper T Cells

  • Helper T cells (CD4+) recognize and respond to specific pathogens, activating other immune cells to respond.
  • Helper T cells are activated by antigen presentation from antigen-presenting cells.

Killer T Cells

  • Killer T cells (CD8+) directly kill infected cells that display viral or tumor antigens on their surface.

Plasma Cells

  • Plasma cells produce antibodies, which are proteins that recognize and bind to specific pathogens.

Complement System

  • The complement system is a group of proteins that work together to help eliminate pathogens from the body.


  • Antigens are molecules that can trigger an immune response, such as proteins, carbohydrates, and other molecules on the surface of pathogens.


  • Macrophages engulf and digest foreign particles and pathogens, activating immune responses.

Specific Adaptive Response

  • The specific adaptive response is the targeted immune response to specific pathogens, providing long-term protection against future infections.

Test your knowledge about the central role of Helper T cells in the immune system, their activation process, and their functions in activating B cells and killer T cells. This quiz covers the antigen presentation process and the communication between phagocytes and Helper T cells.

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