Feedback signals are used all the time to adapt our behavior. They can also be very useful when certain parts of your body are not working well. When this happens, a doctor may use a small machine to help the broken body parts do their job, and a feedback signal can be used to tell the machine when to work. This way, the machine and feedback signal can work together with the rest of your body to make sure everything is working correctly.
Have you heard of a "pacemaker" for a heart? This is a small machine that doctors use to help someone whose heart is not working properly. If you put your ear on your parent's chest you can hear their heart beating. Do you notice how regular this beat is? This regular rhythm is very important. Your heart needs to beat regularly, with beats evenly spaced in time, so it can pump blood throughout your body. Unfortunately, some people's heartbeats beat too fast or too slow, and this can be very dangerous.

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