Both these effects reduce the workload of the heart, so beta blockers are of value in treating the symptoms of angina pectoris, the chest pain brought on by narrowing of the coronary arteries that causes inadequate delivery of oxygen-rich blood to the heart muscle.
3 1. The invention and the history of the Dell computer is quite interesting. First of all, it was in 1984 when Michael Dell, a student at the University of Texas at Austin, created the company PC's Limited. He only had a starting capital of $1,000.
Michael Dell first built and sold personal computers from his dorm room at the University of Texas in 1984 at the age of 19. The original name of the company was PC's Un â¦ limited.     Michael became the youngest CEO to head a Fortune 500 company when the company was first included on the list in 1992.