Human Biology

(Sean Pound) #1

1.62. Lymphatic System http://www.ck12.org


Vocabulary



  • antigen: Protein that is recognized as foreign and causes an immune response.

  • bone marrow: Soft connective tissue in spongy bone; makes blood cells.

  • immune response: Body’s defense against a specific pathogen.

  • immune system: Organ system that defends the body from pathogens.

  • lymph: Clear fluid that drains through the lymphatic system and into the bloodstream.

  • lymph nodes: Small, oval structures located along the lymph vessels where pathogens are filtered out and
    destroyed.

  • lymphocytes: Type of white blood cell that is a key cell in the immune response to a specific pathogen.

  • spleen: Organ that filters pathogens out of the blood.

  • thymus gland: Gland that stores and matures lymphocytes.

  • tonsils: Glands that trap pathogens that enter the body through the mouth or nose.


Summary



  • The immune system includes lymph organs, lymph vessels, lymph, and lymph nodes.

  • Lymph organs include the red bone marrow, thymus gland, spleen, and tonsils.

  • Lymphocytes, including B cells and T cells, are key cells in the immune response.


Practice


Use the resource below to answer the questions that follow.



MEDIA
Click image to the left for more content.


  1. What are some of the functions of the lymphatic system?

  2. How do the lymph nodes act in the lymphatic system?


Review



  1. What are some examples of lymph organs?

  2. What is the role of the lymphocytes?

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