Your uncle was just admitted to the hospital with a blood pressure of 220/145. after a battery of tests, he was told he has essential hyptertension. in his history, it is noted that he is a smoker, obese and works a very stressful job. the physician talks to him about quitting smoking, losing weight and managing stress. why? what are the physical things that happen to the body that can contribute to hypertension as a result of those risk factors?