Groups of different types of tissues are arranged together to form organs. For example, the stomach includes mucus membrane tissue, muscle tissue, a layer of tissue lining the abdomen, etc. Organs, in turn, are grouped into systems. Homeostasis encompasses many body processes. We probably think of maintaing a constant body temperature, but homeostasis also includes water balance, which is influenced by the amount of water in the external environment and whether that is fresh or salt water.
Water balance is regulated through such things as thirst and urination.
Labor contractions push the baby against the cervix causing the cervix to dilate. This, in turn, triggers the production of oxytocin , a hormone which triggers stronger contractions. A negative feedback loop works in the opposite direction from what it is trying to accomplish. An example of a negative feedback loop involved in homeostasis is maintenance of body temperature. There are four types of tissue cells in our bodies.