Capillaries arise from some organs. Capillary networks join together to form veins. Blood travels from one organ to another through veins. In vertebrates there are two types of portal circulation namely hepatic and renal.
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Capillaries arise from some organs. Capillary networks join together to form veins. Blood travels from one organ to another through veins. In vertebrates there are two types of portal circulation namely hepatic and renal.