WordNet
n. blood found in the veins; "except in the pulmonary vein venous blood is rich in carbon dioxide and poor in oxygen"
Wikipedia
Venous blood is deoxygenated blood which travels from the peripheral vessels, through the venous system into the right atrium of the heart. Deoxygenated blood is then pumped by the right ventricle to the lungs via the pulmonary artery which is divided in two branches, left and right to the left and right lungs respectively. Blood is oxygenated in the lungs and returns to the left atrium through the pulmonary veins.
Venous blood is typically colder than arterial blood, and has a lower oxygen content and pH. It also has lower concentrations of glucose and other nutrients, and has higher concentrations of urea and other waste products. The difference in the oxygen content of arterial blood and venous blood is known as the arteriovenous oxygen difference.
Most medical laboratory tests are conducted on venous blood, with the exception of arterial blood gas tests. Venous blood is obtained for lab work by venipuncture (also called phlebotomy), or by finger prick for small quantities.
Usage examples of "venous blood".
There were big, dull, dark splotches, the venous blood dripped by all flesh wounds.
It's just like getting venous blood only you get it out of an artery.
Now Christine was stroking the outside of her thigh with an index finger whose nail was the dark shade of venous blood.
When in the tropics he treated a number of sailors by blood-letting, he observed that the venous blood was much nearer in colour to the paler arterial blood than was usual at home.
The doctor's idea was that in Samadhi the physical mind is still, and if we look only to the physical body, then it seems that the venous blood collects in the brain and brings about a sort of anaesthesia of the brain.
Apart from a trickle of dark, venous blood from his right ear he did not appear to be hurt.
We know that during violent expiratory efforts the pressure of the arterial blood within the vessels of the eye is increased, and that the return of the venous blood is impeded.
It did not come, there was only the dark seepage of venous blood, and he sighed.
He puts his wineglass down on the table, the stem landing a-tilt on a crayon, not noticing when it spills and covers David's half-finished drawing with something that looks horribly like venous blood.
Bleeding from several deep gashes (kzinti arterial and venous blood varied in color between purple and orange), they staggered apart.
Arterial venous blood gushed over the animal's white down stained the snow under her front hooves mingled es of red.
It was the dull, dark red of venous blood, the red of senescent suns.