Human Immune System Overview

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11 Questions

What is the main function of the immune system?

Protecting the body from harmful microorganisms

Which cells produce antibodies to lock onto specific antigens?

B lymphocytes

How do phagocytes like macrophages and dendritic cells contribute to the immune response?

They consume intruders and gather information about them

What helps the immune system fight off the intruders as viruses and bacteria struggle to multiply?

High temperature

What is the role of white blood cells in the immune system?

Destroy antigens

Which cells are responsible for engulfing and destroying antigens in the immune response?


What triggers an immune response in the body?


Which type of cells use information from phagocytes to locate and destroy infected body cells?

T cells

How do antibodies produced by the immune system help protect against future infections?

Lock onto antigens

What is the primary function of vaccines in supporting the immune system?

Provide tools to fight specific diseases

Which immune response involves immediate defense mechanisms against threats without prior exposure?

Innate response

Study Notes

  • Human body is under constant attack from harmful microorganisms such as viruses, fungi, and bacteria.
  • Immune system is a defensive mechanism that protects the body from these threats.
  • Combination of tissues, cells, and organs make up the immune system including lymph nodes, lymph vessels, lymphocytes, white blood cells, bone marrow, and skin.
  • White blood cells, or leukocytes, continually scan the body for suspicious signs.
  • When antigens breach the first line of defense (skin), they use the body's resources and multiply rapidly, triggering an immune response.
  • Phagocytes, such as macrophages and dendritic cells, enter the bloodstream and consume the intruders, gathering information about them.
  • Lymphocytes, specifically T cells, use this information to locate and destroy infected body cells.
  • B lymphocytes produce antibodies that lock onto specific antigens and destroy them.
  • Symptoms like high temperature can help the immune system fight off the intruders as viruses and bacteria struggle to multiply in a warmer body.
  • Vaccines help the immune system fight against germs when it is weak.
  • Humans have three types of immunity: innate, adaptive, and passive.
  • Once the body encounters an antigen, the produced antibodies remain in the body to help fight off future infections.

Test your knowledge about the human immune system, the body's defense mechanism against harmful microorganisms. Learn about the roles of white blood cells, lymphocytes, antibodies, and vaccines in protecting the body from infections.

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