The Avalon Project of the Yale Law School here provides the text of all 112 articles of the OAS charter, adopted at the Bogota Conference of American States, March 30-May 2, 1948.

[Free Registration/Login may be required to access all resource tools.] The nervous system, together with the endocrine system, controls all the other organ systems of the human body. Learn more about the nervous system in this learning...

[Free Registration/Login may be required to access all resource tools.] When you think of the processes of breathing, the lungs probably come to mind. The lungs are the main organ of the respiratory system. However, many other organs are...

[Free Registration/Login may be required to access all resource tools.] Explains the process in which organ systems work to maintain a stable internal environment.

At the end of this tutorial, the learner will understand the basic structure that underlies all systems, including human groups and organizations. It is 2 of 3 in the series titled "What are Systems?."