The bionic pancreas sends a signal to a device to release hormones into the bloodstream to regulate blood sugar. identify one hormone the device would most likely release.

The glucose levels in the blood are regulated by two hormones secreted by the pancreas. The bionic pancreas can send the signals to release the hormone responsible for the blood glucose regulation.

The device, which receives the signal from bionic pancreas can release glucagon or insulin. As this device is used for the people suffering from diabetes, the device is more likely to release insulin.

Hence, the answer is insulin.

"a.) well–developed vascular system."