The heart receives its own supply of blood from a network of arteries, called the coronary arteries. Two major coronary arteries branch off from the aorta near the point where the aorta and the left ventricle meet:
Walton, Ernest Thomas Sinton - Student Encyclopedia (Ages 11 and up) (1903-95), Irish physicist. Born in County Waterford, Ireland, Walton, with Sir John D. Cockcroft, received the 1951 Nobel prize in physics for the development of the first nuclear-particle accelerator.
Discovery of the Proton Ernest Rutherford discovered the existence of the proton in 1918 through an experiment that sent alpha particles through nitrogen gas. Importance of the Proton The proton is important because the number of protons in the nucleus of an atom determines which chemical element the atom is.