Where does blood come from?

Sweden scientists have discovered how the first blood cells form during human development as they change from endothelial cells to hematopoietic.

A laboratory model of human stem cell was developed, observing the expression of blood cell and endothelial cell genes in each individual cell, a progression from an endothelial state was found.

 Niel-Bjarne Woods, was in charge of the study, he said understanding how the first human blood cells develop will provide more information on how to generate blood stem cells for treatment of blood disorder.

Human blood is composed of several specialized cells for different purposes like providing oxygen and immune response against viruses and bacteria.

During embryonic development, the first stem cells form and leads to production of all the blood cells you will produce in your lifetime.

The cells changing to blood in the embryo begin as endothelial cells that make up the walls of the developing arteries. After sometime, it developed into tightly packed spindle shaped endothelial cells and later detach to form round cells of the blood and released into circulation.