Cardiac electrophysiology is the science of elucidating, diagnosing, and treating the electrical activities of the heart. The term is usually used to describe studies of such phenomena by invasive (intracardiac) catheter recording of spontaneous activity as well as of cardiac responses to programmed electrical stimulation (PES).
Ancient Egyptian Pyramids in Giza. Egyptian pyramids are great monument of a great civilization that was born seven thousand years ago. The ancient Egyptians built more than 90 royal pyramids, from about 2630 BC until about 1530 BC.During that time, the pyramid shape evolved from a series of stepped terraces to sloped pyramidal shape.ncient Egyptian Pyramids in Giza. Egyptian pyramids are great monument of a great civilization that was born seven thousand years ago. The ancient Egyptians built more than 90 royal pyramids, from about 2630 BC until about 1530 BC.
Egyptian Social Structure. Egyptian society was structured like a pyramid. At the top were the gods, such as Ra, Osiris, and Isis. Egyptians believed that the gods controlled the universe. Therefore, it was important to keep them happy. They could make the Nile overflow, cause famine, or even bring death. In the social pyramid of ancient Egypt the pharaoh and those associated with divinity were at the top, and servants and slaves made up the bottom. The Egyptians also elevated some human beings to gods.