Changes

==Physiology==

==Physiology==

The [[Vascular Development - Anatomy & Physiology|development of the vascular system]] occurs following three distinct processes:  

The development of the vascular system follows three distinct processes:  

*Vasculogenesis: the formation of blood vessels during the third week of gestation in domestic mammals, initially in the yolk sac and afterwards in the allantois from endothelial progenitor cells.  

*Vasculogenesis: the formation of blood vessels during the third week of gestation in domestic mammals, initially in the yolk sac and afterwards in the allantois from endothelial progenitor cells.  

*Angiogenesis: the sprouting of new capillaries from pre-existing vessels.  

*Angiogenesis: the sprouting of new capillaries from pre-existing vessels.