Hormones

The human body has the ability to regulate its internal state that persists despite the changes in the external environment. This process of keeping the internal environment of the human body at an appropriate level is called Homeostasis. Now, to maintain this constant internal environment, various parts and organs of the human body must function as well as communicate with each other properly.

For instance, the internal body temperature and the level of various minerals and salts must be maintained at a predetermined level and should not alter. Furthermore, various parts and organs of the human body must communicate with each other properly. This is to ensure that the human body can respond to the changes in the internal as well as external environment in a suitable manner.