Function. While veins usually carry deoxygenated blood from tissues back to the heart, in this case, pulmonary veins are among the few veins that carry oxygenated blood instead. Oxygenated blood from the lungs is circulated back to the heart through the pulmonary veins that drain into the left atrium.unction. While veins usually carry deoxygenated blood from tissues back to the heart, in this case, pulmonary veins are among the few veins that carry oxygenated blood instead. Oxygenated blood from the lungs is circulated back to the heart through the pulmonary veins that drain into the left atrium.
There are five major problems in defining the term 'terrorism' and building a consensus. The first major problem faced by the academics and even the nations in defining terrorism is the relativist enmesh of the concept. For one it is a freedom fighting, while for the other it is terrorism.
The claim that a freedom fighter cannot be involved in terrorism, murder and indiscriminate killing is, of course, groundless. A terrorist organization can also be a movement of national liberation, and the concepts of âterroristâ and âfreedom fighterâ are not mutually contradictory.