1 Blood Cells: The most common types of blood cells are:  red blood cells (erythrocytes). The main function of red blood cells is to collect oxygen in the lungs and deliver it through the blood to the body tissues. Gas exchange is carried out by simple diffusion.
Rutherford and Bohr describe atomic structure1913. Photo: Niels Bohr's research notes for his new atomic theory. In 1911, Niels Bohr earned his PhD in Denmark with a dissertation on the electron theory of metals. Right afterwards, he went to England to study with J.J. Thomson, who had discovered the electron in 1897.
Atom History Timeline Erwin Schrodinger John Dalton - Designed symbols to show how atoms combine to form other substances Ernest Rutherford - Discovery of the Nucleus! - Found that an atom is made up mainly of empty space J.J Thompson/Discovery Of Electrons - Thomson determined the charge to mass ratio (e/m) of an electron equaled 1.759 x 108 C/g through experiments he did with gas discharge tubes (Cathode Ray Tube Experiment) Democritus - Believed that the universe was made of tiny âindivisibleâ particles