When a circulatory system and computing system are connected by abstraction, it allows for the exchange of information and data between the two systems. This enables the circulatory system to control the computing system and receive feedback from it, allowing for the development of more complex systems. By abstracting the two systems, it allows for the development of powerful medical applications that can monitor and adjust the circulatory system in real time. For example, this could be used to adjust a patient's blood pressure or monitor their heart rate in order to prevent dangerous conditions from developing.