3. Define positive feedback and give one example. a. List all of the body systems that are involved the feedback loop of a women going into labor.

## Step 1<br />Positive feedback is a type of feedback mechanism in which the output of a system amplifies the input. This amplification continues until the system reaches a certain threshold, which is often the end of the process. This type of feedback is common in biological systems, particularly in processes that need to be completed quickly.<br /><br />## Step 2<br />An example of positive feedback is the process of childbirth. During labor, the hormone oxytocin is released, which stimulates contractions. These contractions push the baby towards the birth canal, which in turn stimulates the release of more oxytocin. This cycle continues until the baby is born.<br /><br />## Step 3<br />The feedback loop of a woman going into labor involves several body systems. The nervous system is responsible for sending signals to the brain in response to contractions. The muscular system is responsible for the contractions themselves. The reproductive system is responsible for the production of oxytocin and the contractions. The endocrine system is responsible for the release of oxytocin. The circulatory system is responsible for delivering oxygen and nutrients to the muscles and the brain. The respiratory system is responsible for providing oxygen to the body. The skeletal system provides the structure for the body and the muscles to work against.