whats the difference between a pulmonary vein and other veins?
480429
A pulmonary vein is called a vein only because it brings blood back to the heart.  However, the blood that it transports back to the heart is oxygenated (contains oxygen).  All other veins carry deoxygenated blood (blood without oxygen).  The pulmonary veins as well as the pulmonary arteries are special because they carry different types of blood then the typical vein or artery.  For another example, the pulmonary artery carries deoxygenated blood.  Arteries carry oxygenated blood, however, this particular artery (the pulmonary artery) carries deoxygenated blood because it is moving from the heart to the lungs so as to get oxygen from the lungs.  Then the blood will travel back through the pulmonary veins (with oxygen in it--oxygenated).  So as you can see, the name of the pulmonary veins and pulmonary arteries has a lot to do with whether it brings blood back to the heart (veins do this) or it takes it away from the heart and out to the body (arteries do this).  If you try not to focus on what type of blood it is (oxygenated or deoxgenated) you may get confused less.  The pulmonary veins and pulmonary arteries can be confusing if you think about what type of blood they're carrying.  They are the exceptions to the typical vein or artery.
701576
The lymphatic vessels resemble veins in that they transport body fluids. The lymphatic vessels contain valves similar to those found in the major veins of the body.
461727
Fish have 2 major chambers (one auricle and one ventricle, plus one sinus venosus - before the auricle - and a conus arteriosus - after the ventricle). However, in the lungfishes there is a partial separation of both the main chambers, linked to the existence of a pulmonary blood circuit. \nAmphibians have two auricles and one ventricle, and the latter has deep "pockets" where oxygenated and deoxygenated blood goes, so that these two blood volumes do not mix much  while each flows through its respective circuit.\nReptiles... well, there is no such thing as a "reptile" really but rather three different groups. Both the turtles and the squamates (lizards and snakes) have two auricles and one ventricle, and the latter is partially separated by a spiral septum so that the pulmonary and body circuit do not usually mix (except in special circumstances). \nCrocodiles are related to birds, and just like them, they have a four chambered heart, with two auricles and two ventricles. However, in crocs the oxygenated and deoxygenated blood can get mixed because they have a hole between the paired main blood vessels that leave the heart. \nBoth birds and mammals have also four-chambered hearts with completely separate pulmonary and body circuits. \nCheck the link, there are good schematic illustrations and explanations for each taxon.
745301
This something would be aortic artery pressue (reflecting systemic circulation) is equal to pulmonary artery pressure and this would happen in pulmonary hypertension. Yet, in pulmonary hypertension, closure of the pulmonic valve would be rather delayed than increase in intensity.
16005
The body's circulation has two parts, with the heart acting as a double pump. Blood from the right side pump is dark red (bluish) and low in oxygen. It travels along pulmonary arteries to the lungs where it receives fresh supplies of oxygen and becomes bright red. It flows along pulmonary veins back to the heart's left side pump.\n\n \n\n \n\n\nBlood leaves the left side of the heart and travels through arteries which gradually divide into capillaries. In the capillaries, food and oxygen are released to the body cells, and carbon dioxide and other waste products are returned to the bloodstream.The blood then travels in veins back to the right side of the heart, and the whole process begins again.
925637
You have an artery on both sides and a vein on the other (jugular) same as all parts of your body. One takes blood to the heart (vein) one back into the body full of oxygen (artery)
283577
Arteries pump blood away from the heart and toward the arms and legs.  Most clots are in the veins, which can break off and move to the heart and then to the lungs.
281313
Thee's two jugular veins - the internal and external.  They're one of the main veins in the body and carry deoxygentaed blood from the brain back to the heart.  If you cut the JV you would die within minutes unless it was done under controlled circumstances (in an operating room for example) or unless you received immediate medical attention.
395359
oxygen molecule in lungs diffuses into the blood stream return to the heart via the pulmonary vein (the only vein to carry oxygenated blood) into the left atrium, left ventricle, through the aortic semilunar valve, through the ascending aorta, arch of the aorta, descending aorta, common illiac artery, external illiac artery, femoral artery... from there it  depends where in the hind leg... by the way these are human names, I don't know how many would be different for animals... my comparative anatomy teacher used to make us do these kinds of questions all the time ;-)
956582
A simple leaf has an undivided blade. However, the leaf shape may be one of lobes, but the gaps between lobes do not reach to the main vein. A compound leaf has a fully subdivided blade, each leaflet of the blade separated along a main or secondary vein.\n\nI do not have permissions to give a thumbs up, but the person above me deserves one for the link.\n\nAndy
560165
mainly, the heart pumps blood forward, but can be aided by the action of the muscles--they help keep blood and lymph flowing.  Additonailly, the veins have one way valves so that once the blood goes through a valve, it can't go backwards while the heart is relaxing.
280752
When the blood is returning to the heart through veins, it is blue because it has delivered its oxegyn and nutrients.  Once it returns to the heart and starts making its trip back through arteries, it is red again.\n\nBlood exposed to the outside air will always retain its red color, even if a vein is severed because once it leaves the body, oxygen in the air will change it back to red.
227453
There are many veins in the human brain...but the main ones are the right and left jugular veins...they allow blood flow in and out of the brain causing it to maintain a homeostatis that is critical for keeping a human alive.
546613
The heart is what pumps blood and is the centerpiece of the circulatory system. Without it the blood could not carry the nutrients the body needs. The lungs take in oxygen to help feed the bloodstream. Basically both organs do the same job, just in different ways and for the same end. Keeping YOUR blood infused with the nutrients the body requires to sustain itself. Hope this helps.
16348
The heart is a double pump with four chambers, each separated by valves that only permit blood to flow in one direction. Basically, the right side of the heart pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the body.
630194
The system of veins and arteries that moves (circulates) the blood around in your body.
452331
This is sort of a myth, with some exceptions.  I remember as a kid hearing that a single bubble of air would kill you.  This is simply not the case.  A small bubble in your vein is not harmful.  Now if you send a large bubble of air back to your heart, you create an air embolism.  Air takes up space and in an enclosed area, like a blood vessel it can get lodged and can prevent blood getting past it.  Even then it may not kill you, but it could cause an infarct (lack of blood/O2 supply causing cellular death)