venous blood

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ve·nous blood

blood which has passed through the capillaries of various tissues, except the lungs, and is found in the veins, the right chambers of the heart, and the pulmonary arteries; it is usually dark red as a result of a lower content of oxygen.

venous blood (v)

Etymology: L, vena, vein; AS, blod
dark red deoxygenated blood that has passed from the left ventricle through the systemic circulation en route to the right atrium.

ve·nous blood

(vē'nŭs blŭd)
That which has passed through the capillaries of various tissues, except the lungs, and found in the veins, the right chambers of the heart, and the pulmonary arteries; usually dark red as a result of a lower oxygen content.

ve·nous blood

(vē'nŭs blŭd)
Blood that has passed through capillaries of various tissues, except the lungs, and is found in veins, right chambers of heart, and pulmonary arteries; usually dark red due to lower oxygen content.


the red fluid that circulates through the heart, arteries, capillaries and veins carrying nutrients and oxygen to the body tissues and metabolites away from them. It consists of a yellow, protein-rich fluid, the plasma, and the cellular elements including leukocytes, erythrocytes and platelets. It has a high viscosity and osmotic tension and clots on exposure to air and to damaged tissue. It has an essential role in the maintenance of fluid balance.
In an emergency, blood cells and antibodies carried in the blood are brought to a point of infection, or blood-clotting substances are carried to a break in a blood vessel. The blood carries hormones from the endocrine glands to the organs they influence. And it helps in the regulation of body temperature by carrying excess heat from the interior of the body to the surface layers of the skin, where the heat is dissipated to the surrounding air. See also bloody.

arterial blood
oxygenated blood in the arterial side of the circulation between the cardiac ventricles and the capillaries.
blood buffers
substances which enable the blood to absorb much acidity without significant change in pH. The principal ones are the bicarbonate and hemoglobin buffers.
central blood
blood from the pulmonary venous system; sometimes applied to splanchnic blood, or blood obtained from chambers of the heart or from bone marrow.
central venous blood
unoxygenated blood collected centrally from the right atrium or venae cavae.
citrated blood
blood treated with sodium citrate to prevent its coagulation.
blood clotting cascade
see coagulation cascade.
cord blood
that contained in the umbilical vessels at the time of delivery of the fetus.
defibrinated blood
whole blood from which fibrin has been separated during the clotting process.
extracorporeal blood flow
see extracorporeal circulation.
blood in feces
see melena.
blood islet
aggregates of splanchnic mesoderm on the surface of the yolk sac and allantois; the first blood cells in the embryo.
blood lactate
this estimation has good predictive value in a number of diseases, e.g. intestinal obstruction in horses.
blood in milk
appears as clots or as diffuse red tint. Common only in recently calved cows or after trauma. Of no disease significance but renders the milk unsuitable for sale.
Enlarge picture
Blood clots in pink milk. By permission from Blowey RW, Weaver AD, Diseases and Disorders of Cattle, Mosby, 1997
occult blood
that present in such small amounts as to be detectable only by chemical tests or by spectroscopic or microscopic examination. See also occult blood test.
blood osmolality
see serum osmolality.
peripheral blood
that obtained from the circulation remote from the heart; the blood in the systemic circulation.
selective blood agar
see blood agar.
shunted blood
blood which is not oxygenated in the lung because it passes through unaerated tissue.
sludged blood
blood in which the red cells have become aggregated into clumps and is most marked where the flow rate is slowest, i.e. in the capillaries.
blood solutes
see individual elements, metabolic products, hormones and the like.
stiff blood agar
see blood agar.
blood substitutes
synthetic substances that may be used in place of blood or its components include dextran, hydroxyethyl starch, polyvinylpyrrolidone, gelatin and perfluorocarbon.
blood urea nitrogen (BUN)
see urea nitrogen.
blood urea test
see urea nitrogen.
blood in urine
venous blood
blood which has passed through the capillaries and discharged its oxygen load to tissues and relieved the tissue load of carbon dioxide by absorbing it, and is on its way to the lungs to reverse these processes; is dark red in color due to the high concentration of reduced hemoglobin.
blood volume expanders
are used in the treatment of shock to restore tissue perfusion. Various fluids including whole blood, plasma, crystalloids and colloids may be used.
blood in vomitus
whole blood
that from which none of the elements has been removed, especially that drawn from a selected donor under aseptic conditions, containing citrate ion or heparin, and used as a blood replenisher.
References in periodicals archive ?
However, in the age range from 6 to 35 years at the same threshold, in venous blood MS-QMA identified only 50% of all FM females.
This could be the reason for the observed increase in venous blood oxygen saturation, postcapillary blood amount and higher blood flow in both tissue depths.
Venous blood clots don't simply disappear because a patient has left hospital.
There was no correlation between total pain perceived on the GTT and peak venous blood lactate.
However, in patients with circulatory failure, the reliability of cental venous gases has been challenged because it may not reflect the venous blood from hepatosplanchnic circulation, where hypoperfusion is common.
Abnormal fetal heart rate patterns arise even later, only after venous blood flow abnormalities are present.
Unlike oral exposure, in which the liver is exposed primarily through the first pass portal venous blood, intravenous and intraperitoneal routes expose the liver by arterial perfusion.
Women's Health Initiative study recently confirmed that while Prempro (one type of HRT) reduced risk of hip and other fractures, and colon cancer, it was associated with a modest increase in breast cancer, stroke, heart attack, and venous blood clot risk.
Patients today are typically sent to a lab for a venous blood draw which is clearly burdensome to the patient and a practical limitation to efficient monitoring and in-office patient consultation by their doctor.
Blood is a thick red fluid: arterial blood contains oxygen and is bright red; venous blood is de-oxygenated and is dark purplish red.
Venous blood is darker in color than arterial blood because of the difference in dissolved gases.
08 - although a sample of arterial blood was drawn rather than the venous blood required by state law, Barshop had said previously.