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.
- Lymphatic Systemat http://www.youtube.com/watch?v=Kh-XdNnTZUo (1:08)
MEDIA
Click image to the left for more content.- What are some of the functions of the lymphatic system?
- How do the lymph nodes act in the lymphatic system?
Review
- What are some examples of lymph organs?
- What is the role of the lymphocytes?