Because arteries and arterioles become less elastic as people age, they cannot relax as quickly during the rhythmic pumping of the heart. As a result, blood pressure increases more when the heart contracts (during systole)âsometimes above normalâthan it does in younger people. Abnormally high blood pressure during systole with normal blood pressure during diastole is very common among older people.
Then in 1897, Thompson discovered the first component part of the atom: the electron, a particle with a negative electric charge. Discovery of the Atom. By the 19th century, technology had advanced greatly and many elements had been discovered to work with.
In 1884, Thomson became Cavendish Professor of Physics. In 1890, he married Rose Paget, and he had two children with her. One of his students was Ernest Rutherford, who would later succeed him in the post. Thomson's discovery of the electron began in 1895 with a series of experiments in the Cavendish Laboratory.