Veins

Aortic.

The upper, or superior vena cava is a pink-ish colour.

Moving blood to and from the heart

Vessels

blood can still return via the deep veins

During embryologic development, there are two umbilical veins, left and right, that drain blood from the placenta to the heart. The right umbilical vein regresses and under normal circumstances is completely obliterated during the second month of development. The left umbilical vein persists and delivers blood from the placenta to the developing fetus. The diameter of the intra-abdominal umbilical vein increases linearly, from 3 mm at 15 weeks of gestation to 8 mm at term.

Blood clotting, or coagulation, is the body's natural reaction. If it didn't clot, you could possibly keep on bleeding until you bled to death. This helps to prevent that from happening. In humans, coagulation usually involves a cellular platelet and a protein factor . The platelets forms a sort of "plug" over the opening, like the prick of the needle from drawing blood. The protein factors then reinforce this "plug" of sorts to help keep it solid until the opening heals, scabs over, closes, ect.

They ensure that the blood flows only in one direction (back toward the heart).

large veins have narrow tunica intima.and tunica media consist of many layers of smooth muscle which are separated by collagenous connective tissue,and have very few elastic fibers.tunica adventitia is broad,and formed by collagen,tunica adventitia have vasa vasorum.example is femoral and renal vein. in medium size veins tunica intima is a bit more then endothelial call.and have fibrous supporting layer.tunica media is composed of 2 to 4 layers of smooth muscle fibers.tunica adventitia is thick layer and made up of collagen fibers. ........................... maniba ,hebei united medical university tangshen ,,hebei .,,,china

no

Deep vein thrombosis (DVT) is when you get blood clots in the deep veins of your legs (typically the femoral veins). Symptoms of DVT include leg swelling (esp asymmetric or unilateral swelling) and leg pain. The #1 life threatening complication of DVT is pulmonary embolism (PE). PE occurs when a piece of clot from the DVT breaks off and gets returned to your heart with the rest of the venous blood. The clot gets shot into your lungs via the pulmonary artery, where it will eventually get stuck. For a smallish or medium size clot, the classic symptoms are pleuritic chest pain (chest pain that gets worse with a deep breath... it kind of feels like a stitch you get from running too much), sudden-onset shortness of breath, cough (esp coughing up blood or hemoptysis), and rapid shallow breathing (tachypnea). These are the symptoms the textbooks give you, but PE is notoriously hard to diagnose because the symptoms are variable and not specific. For a massive PE, often the patient will die of right-sided heart failure before even reaching the hospital.

The AV300 emits an infrared light that detects hemoglobin (a red blood cell that carries oxygen throughout the body). Hemoglobin concentration is much higher in the veins than in the rest of the tissue so the higher concentrations of it show up as a shadow. The oxygen reacts with the light, which is why you see where your veins are.

Because this shape works for the body. Somewhere in the evolution time line the creature which had the first cylindrical blood vessel survived and that information has been stored in the DNA and has past it on to its offspring.

The reason I believe it works is that it is the easiest shape to dilate or constrict.

Viens do not have a pulse, but they do have valves that arteries do not. Most veins carry oxygenated blood toward the heart. The only exception is the pulmonary veins that carry oxygenated blood to the left atrium of the heart. The same is true for arteries. They carry oxygenated blood from the lungs to the rest of the body except the lungs. The pulmonary arteries are the only exception because they carry deoxygenated blood to the lungs.

Liver.

The azygos venous system returns blood from the posterior walls of the thorax and the abdomen and dumps directly into the superior vena cava. The origin of this system begins at the various capillaries, it is a large and very variable network of veins.

the azygos vein is situated on the rightside. embryologically the azygos vein must commences from the postrior surface of the inferior venacava at the level of renal veins. this azygos vein is called lumbar azygos vein.

azygos vein may also commences by the fusion of the right subcostal vein and right ascending lumbar vein.

development from the azygos line of veins of the right side and right posterior cardinal vein.

this forms the azygos system of veins including others like, hemiazygos vein, accessory hemiazygos vein.

There is the Vena Cava, veins, and venules. Then we have the Aorta, arteries, and arterioles.

Vasculitis can affect veins

The carotid artery runs from the heart to the brain - via the neck. It's the pulse you can feel if you place your finger at the side of your throat.

They're "colorized" by private firms and sold as collectibles at inflated prices. They're technically considered altered coins and have no numismatic value.

During the 1970's, the Garden State Parkway in New Jersey increased their toll from 15 cents to 25 cents. This caused a public outcry, and spurred a grass-roots protest. Parkway users were encouraged to dye or paint quarters red, and use them as tolls to record their protest vote.

I remember that during this decade red quarters proliferated; I would not be surprised if similar protests with similar red-quarters sprang up around the country. Every time I see a red quarter (fewer and fewer these days) I remember those parkway toll protests.

There must be millions of them still in circulation.

Many bars with a jukebox would have a supply of quarters marked with nail polish that were used to make sure there was music when the first customers came in. When the vending company emptied the cash box, these would be returned to the bartender. ANOTHER STORY:

The colored coins appeared soon after the multi-play jukeboxes appear in bars and honky tonks. At the time one could play 1 song for a nickle or 5 for a quarter. The market coins served where used in varity of ways, one was the house dropping one in the jukebox to "Liven The Joint Up" or if when they matched a customer to see who would put the quarter in the box the house lost The house never lost of course since when the coin box was emptied all the red coins where given back to them. FIVE PLAYS FOR A 25 CENTS! Those were the days my friend.

Plasma

i have contancts and even if you don't see a doctor. you could become blind or something and that would really suc. :(

go see a doctor. it could be one of many things but one of those things can make you blind so i would hurry.

It is nothing to be concerned about, it happens to everybody, and it doesnt mean anything. It happens because blood is being pumped through it.

Right Atrium