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
Standard anatomical position Frankfurt plane with the mandibular plane. For dogs, the standard anatomical position is having the abdomen ventral by each paw standing on the supporting surface. Standard anatomical position Because animals can change orientation with respect to their environment, and because appendages (arms, legs, tentacles, "etc.") can change position with respect to the main body, it is important that anatomical terms of location refer to the organism when it is in its standard anatomical position. Thus, "all descriptions are with respect to the organism in its standard anatomical position", even when the organism in question has appendages in another position. However,