Although the graphs all represent differing hearts, medical experts can read all of them in the same way. Though difficult to see in Figure 4, Figure 5 shows a more in-depth explanation of what to see on the pressure-volume graphs of a heart. Figure 5 can prove that the external power source connected to the left and right ventricles, send a signal of pressure to induce a contraction. After the ventricles have contracted, and ejected the majority of the blood to flow to its designated location, the ventricles then will want to relax. During this period of relaxation, the pressure is declining and the volume is rising. This then starts the entire cardiac cycle over again with another signal from the external power source to then contract and eject the blood. As previously stated, this is very crucial for medical experts to understand and program their patients external power sources to signal the correct amount of pressure and work for the ventricles to be expected of. Not only should they be programmed correctly but they need to have the adaptability to then adjust when a patient is going from inactive to active because these different physicality’s will require different levels of work. If the temporary Total Artificial Heart cannot keep up with the lifestyle of the owner then there could be possible fatal issues because the heart is not able to circulate the blood well enough where the body can continue with the change from inactivity to activity.