If a body system does not work properly then the other body systems will also fail because every system is needed for a person to live properly. For example if the respiratory system does not work properly then the other systems will be harmed as oxygen will not be able to move to other parts of the body. As a result, the kidneys will fail and the heart will stop working and the person will die.
If the circulatory system isn't working, then blood can't be circulated to different parts of the body. As a result many systems like the nervous system, digestive system, and respiratory system won't be able to function.
