Biological Basis to Child Health 9: An introduction to understanding the embryology, composition and function of blood

This article is the most recent in the series of the Biological Basis to Child Health. It focuses on blood as the major fluid component of the body systems. The foetal origins of the main blood cells are considered. An introduction to the function of blood is provided, the homeostasis of the circulation and haemopoiesis (how blood cells are produced) are reviewed. This is essential in order to provide care for patients who have altered physiology which affects their circulatory system and blood profile. A range of conditions can affect the blood and circulatory system and some of these are considered. To provide holistic care it is important to have an understanding of this system in order to support the patient and family.