Veins

18-to 22

The thin walls of the blood vessels are capillaries around the alveolar sacs that permit diffusion of gases in every single red blood cell with oxygen inhaled

...

they are thinner to improve the pressure gradient to allow more O2 in the capillaries, because the pulmonary capillaries have the lowest blood pressure in the body (normally)

right atrium

There is no transportation system in any city that can compare in effeciency with the circular system of our body. If you can imagine two systems of pipes, one large and one small, both meeting at a central pumping station, you will have an idea of the circulatory system. The smaller pipes go from the heart to the lungs and back, while the larger ones go from the heart to the various other parts of the body. These pipes are called arteries, veins and capillaries. Arteries are vessels in which blood is carried away from the heart. In veins,the blood is coming back to the heart. In general terms, arteries are carrying pure blood to various parts of the body, and the veins are bringing back blood loaded with waste products. The pumping station is of course the heart. Arteries lie deep in tissues, except at the wrist, over the instep, at the temple and along the sides of the neck. At any of these places the pulse can be felt, which gives the doctor an idea of the condition of the arteries. The blood in arteries is bright red in color and moves through in spurts. Veins lie closer to the surface of the skin, and the blood in them is much darker in color and flows more evenly. Veins have valves and intervals all along their course.

Fact File: Blood contains red and white blood cells that float inside a liquid called plasma. It also contains thousands of different substances needed by the body. Blood carries all this things round the body and also removes waste products.

Veins and arteries don't enter bone. They are outside of bones. The only thing inside bone is bone marrow.

The pulmonary trunk is the largest artery in the pulmonary circuit that further divides into left and right pulmonary arteries before entering into the left and right lungs.

Blood from the lower extremities, blood flows through the common iliac vein. From the common iliac vein, the blood flows into the inferior vena cava on its way back to the right atrium of the heart.

The hepatic portal vein carries blood (and absorbed nutrients) from the small intestine to the liver.

Liquid flows from high pressure to low.

My veins pop out as well it means you either have low body fat or if your muscle is more than the fat in that area

It is formed through millions of years of pressure cement ton of minerals together, crystallizing and forming certain ores. blah

To and from the heart. in/out the ventricles and the atriums.

the vein thats most subjected to venipuncture is located in the Antecubital fossa (the inner bend of the elbow) in the median antecubital vein(median cubital)

A dorsal vein in the hand is one. Most commonly, for blood draws in a lab, the antecubital vein (at the location opposite where the elbow flexes, between the forearm and the upper arm) is used.

1. Valves in the veins which stop blood flowing backwards

2. As the muscles around the veins contract (from general activity eg walking) they squeeze the veins, therefore forcing blood back to the heart (in just that direction because of valves)

Tortuous, swollen veins in the distal esophagus are called esophageal varices. They are caused by portal hypertension, or elevated pressure in the portal circulation. Esophageal varices can cause severe internal bleeding.
Esophageal varices are varicose veins at the end of the esophagus.

Six hours or more of inactivity. Or at least that's what some squirrel told me but it can't be true because you sleep for six hours every ngiht.

No. If a vein is blown it can no longer be used for an injection.

nothing, if you press it for a long period of time you may loose blodd circulation

Varicose veins can occur anywhere in the body, but are more commonly found on the legs.

By Joshua.Kodituwakku

blood. It is a blood vessel but more specifically a vein. Note there are two: superior vena cava (from upper part of body) & inferior vena cava (coming from lower part of body). They carry oxygen-poor blood back to the heart's right atrium then on to the lungs via the pulmonary artery to exchange carbon dioxide for fresh oxygen.

normal blood flow in portal vein and patent portal vein is a sign of the normal physiological condition of liver blood web and clearness of portal venous way