I was a biomedical technician for 35 years. Continuous BP (given the tech) doesn't work well if there is movement. Also, any BP system would require some constriction (of the wrist) and that takes power. An external, Bluetooth device would be more likely.I know Apple is working on Glucose using LEDs. That has some promise as a built in device.FDA validated Continuous BP and Blood Glucose monitoring would catapult AAPL to a 4 TRILLION $ company.