Veins

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Generally no, there could be some complications with bleeding, but they should be controllable. You can die if the lingual artery is pierced but that's highly unlikely to happen...

Infection is also another risk, but again - manageable if it happens.

oxygenated blood

brt

This is when the valves in your veins that keep blood flowing in one direction (up to your heart) become damaged and do not work anymore. Blood can no longer travel up your veins towards the heart as easily by this route, so other veins take over and that vein becomes useless and unused leading to lumpy varicous veins.

These can often be painful but can be removed surgically as they no longer work properly so it's ok to take them out.

Varicous veins are usually caused by some sort of regular sustained pressure on a particular site, eg always having your legs crossed or having a heavy guitar on your lap a lot. Risk of developing varicous veins is higher in those with sluggish circulation too.

Yes they are tubes. They are filled with blood.

This prevents blood from entering the sealed sections of the vein. The veins remain in the body, but no longer carry blood. This procedure can be performed on an out-patient basis and does not require anesthesia.

It is not just one blood vessel that goes and come back from the lungs. Vessels that leave the heart are known as arterieswhile those that enters the heart are known as veins. The blood leaves the heart via the pulmonary trunk which terminates into 2 pulmonary arteries, one for each lung. The blood then leaves the lungs and enter the heart through 4 pulmonary veins, (all opening into the left atrium), of which each two are from one lung.

They carry oxygenated blood in only a few cells since veins are drawn back into the heart and to the lungs to get oxygenated and back into arteries to be pumped out. If the oxygen from the blood that is being pumped out from your arteries is not being used too much, then the oxygen is still carried by the cell to deliver the oxygen to other organs in the body.

Yes, it could be a sinister sign of a disease It could also be a increased input of blood in your veins

Blood enters the right atrium via three veins: (1) the superior vena cava returns blood from body regions superior to the diaphragm; (2) the inferior vena cava returns blood from the body areas below the diaphragm; and (3) the coronary sinus collects blood draining from the myocardium.

yes they do.

they would be so long that they would be able to wrap all the way round the world

hepatic portal vein

they are actually around the same color but light going through skin is absorbed differently the deeper the veins/arteries are. so the appereance of different color is just a measure of the deepness of said blood vessel. also arteries carry oxygen enriched bright red blood while veins carry oxygen deprived dark red blood, this difference is dark red vs bright red blood also contributes to the apparant change in color.

the liver's conversion of waste products (liver encephalopathy),

Venipuncture

Blood sustains life, but can be incredibly dangerous when it does clot inside the vessels. As long as blood is moving (in a state of flow), it will usually not clot in a healthy individual. The brief explanation is that many different molecular pieces have to join together to form a clot, and as long as they are in a state of flow, that cannot happen. Virchow's triad describes 3 categories of risk factors that increase the risk for blood clots inside the vessels: venous stasis, endothelial injury, and hypercoagulability. Venous stasis includes conditions such as mitral stenosis, atrial fibrillation, and varicose veins, but can also result from sitting for long periods of time without moving (such as on a long flight), or prolonged periods of bedrest (such as in a hospital). Endothelial injury can result from hypertension or diabetes among others. Hypercoagulability can be produced by a number of conditions including nephrotic syndrome, myoglobinemia following trauma or burns, cancer, or pregnancy. Dangerous disorders associated with abnormal clotting include deep venous thrombosis, pulmonary embolism (infarction of the lungs) or stroke, among others.

this happens because of the vien build up structure in order for the blood to pump the thick blood... now go get your since text book class....

as the bell rang joise and the girls were stil taking about the incident that happen to Johan.

The pulmonary artery splits into the left pulmonary artery and right pulmonary artery. The left one goes to the left lung and the right one goes to the right lung to receive oxygen.

There are also pulmonary veins. They carry oxygenated blood from the lungs to the heart.

probably b/c everything inside you is important. Everything.

Veins come up everywhere in your body. They are normally more visible when the vein has dilated. When your veins dilate your Blood pressure drops and heat loss increases.

There are four primary, extremely important valves (or one-way doors) which allow blood into and out of the chambers of the heart.

1) The aortic valve allows blood to flow in one direction, out of the left ventricle and into the aorta, the largest artery of the body, which will supply oxygen and nutrients to the majority of the body tissues.

2) The pulmonary valve allows blood to flow out of the right ventricle and into the pulmonary artery, taking deoxygenated blood to the lungs to be loaded up with fresh oxygen and to release the carbon dioxide from the body.

3) The mitral valve (sometimes called the bicuspid valve) allows blood to flow down from the left atrium and into the left ventricle.

4) The tricuspid valve enables blood flow between the right atrium into the right ventricle.

There are several important diseases (or pathologies) associated with these valves, one example being stenosis of the mitral valve (where the valve itself thickens). The resulting narrowing of the passageway for the blood can lead to numerous complications, and it's a common condition associated with rheumatoid fever.

the second largest artery pof the human body is the pulmonary artery