Question

What are Veins?

Answer 1

Veins carry carbon dioxide in the blood except for the pulmonary vein that carries oxygenated blood from lungs to heart. So pulmonary arteries and pulmonary veins do not carry carbon dioxide. Veins are essential for the organism's body as it carries blood in it. Veins are spread all over the body. Veins usually carry deoxygenated blood from the heart to other parts of the body.

Complete Explanation:
Veins in plants carry cell sap, minerals, and water-rich nutrients into all over the plant body. Leaflet and venation arrangement is a separate set-in plant body. In human beings there are three sets of veins- Deep veins, Superficial veins and pulmonary veins. Each vein is an exception and performs different functions.
Examples of portal vein are- venous blood to the liver. Portal vein or hepatic portal vein arises from hepatic duct of the liver. The vein we will be explaining here is the portal vein. If the portal vein gets damaged it shows liver Cirrhosis.
Veins are present in both animal as well as plant bodies. Blood vessels which carry deoxygenated blood from other parts of the body to the heart are called veins. Veins carry carbon dioxide in the blood except for the pulmonary vein that carries oxygenated blood from lungs to heart.

Note:
As we discussed veins and how essential veins are for the body, Prognosis depends on the nature of the liver and cardiac disease. As well as the location of the shunts. In severe cases liver transplantation may be necessary. So,as we discussed what is portal vein, its function and importance examples of the vein.