Human body to comparative physiology and ecophysiology. Most recently, evolutionary physiology has become a distinct subdiscipline. Human body The human body is the structure of a human being. It is composed of many different types of cells that together create tissues and subsequently organ systems. They ensure homeostasis and the viability of the human body. It comprises a head, neck, trunk (which includes the thorax and abdomen), arms and hands, legs and feet. The study of the human body involves anatomy, physiology, histology and embryology. The body varies anatomically in known ways. Physiology focuses on the systems and organs of the human
Ancient Egyptian anatomical studies the reign of the pharaoh, within which the book is known to have been written. Two individuals, Herophilus, and Erasistratus, both living within Alexandria and participating within the so-called School of Alexandria, both contributed to anatomical understanding and knowledge, as they began a practice of human dissection. Egyptian civilization was responsible for the advent of terms for external body parts, of all body parts practitioners were aware of, "metu", understood to refer to the heart, was central to ancient understandings of anatomy within relevant areas of Egypt. Knowledge of anatomical studies is drawn from papyri and ostraca, especially the Ebers,