CK-12 Foundation
Ck 12: The Lymphatic System
[Free Registration/Login may be required to access all resource tools.] Almost all of us have had a sore throat at some time. Maybe you had your tonsils out when you were younger? Why? Your tonsils are two lumps of tissue that work as...
CK-12 Foundation
Ck 12: Biology: Lymphatic System
[Free Registration/Login may be required to access all resource tools.] Covers the role of the lymphatic system in the immune response.
CK-12 Foundation
Ck 12: Life Science: Circulation and the Lymphatic System
[Free Registration/Login may be required to access all resource tools.] The lymphatic system is a network of vessels and tissues that carry a clear fluid called lymph. The lymphatic system works with the cardiovascular system to return...
CK-12 Foundation
Ck 12: Life Science: Lymphatic System
[Free Registration/Login may be required to access all resource tools.] If pathogens get through the body's first two lines of defense, a third line of defense takes over. This third line of defense involves the immune system. The immune...
CK-12 Foundation
Ck 12: Biology: Immune System Part I Study Guide
This study guide on the immune system covers key terminology and the different lines of defense the human body has to protect itself against pathogens. It is available for download with free registration.
Untamed Science
Untamed Science: Biology: Human Biology
Learn about the basic organization of the body's organs and the major organ system.
Untamed Science
Untamed Science: Biology: Human Biology: Lymphatic System
Find out how the body rids itself of wastes and fights off infections with the help of the lymph nodes and white blood cells.
Soft Schools
Soft Schools: Immune System Quiz
Take this interactive, multiple-choice quiz over the human immune system, then review your score and any missed questions at the end.