1.Any of the blood vessels that carry blood toward the heart. Veins are thin-walled and contain valves that prevent the backflow of blood. All veins except the pulmonary vein (which returns to the heart from the lungs) carry blood having low levels of oxygen. ...
1.Any of the blood vessels that carry blood toward the heart. Veins are thin-walled and contain valves that prevent the backflow of blood. All veins except the pulmonary vein (which returns to the heart from the lungs) carry blood having low levels of oxygen. ...
The meaning of VEIN is blood vessel; especially : any of the tubular branching vessels that carry blood from the capillaries toward the heart. How to use vein in a sentence.
Veins carry deoxygenated blood towards your heart and are often located close to your skin. Veins don’t have a muscular layer like arteries do, so they rely on valves to keep your blood moving. Veins start as tiny blood vessels called venules, which become full-size veins as they come c...
vein,bloodvesselthatreturnsbloodtotheheart.Exceptforthepulmonaryvein,whichcarriesoxygenatedbloodfromthelungstotheheart,veinscarrydeoxygenatedblood.Theoxygen-depletedbloodpassesfromthecapillariestothevenules(smallveins).Thevenulesfeedintolargerveins,whicheventuallymergeintothesuperiorandinferiorvenacavae,largevesselsthat...
Vein, in human physiology, any of the vessels that, with four exceptions, carry oxygen-depleted blood to the right upper chamber (atrium) of the heart. The four exceptions—the pulmonary veins—transport oxygenated blood from the lungs to the left upper
Blood clots often require medical treatment. The definition of deep venous thrombosis (DVT) is a condition in which ablood clotis embedded in one of the major deep veins of the lower legs, thighs, pelvis, or arm. A clot blocks blood circulation through these veins, which carry blood from ...
可数名词 Your veins are the thin tubes in your body through which your blood flows toward your heart. Compare . 静脉 Many veins are found just under the skin. 许多静脉就在皮肤下面。 2 可数名词 Something that is written or spoken in a particular vein is written or spoken in that style ...
One of the vessels which carry blood, either venous or arterial, to the heart. See Artery, 2. Vein One of the similar branches of the framework of a leaf. Vein One of the ribs or nervures of the wings of insects. See Venation. Vein A narrow mass of rock intersecting other rocks, ...
1.Any of the blood vessels that carry blood toward the heart. Veins are thin-walled and contain valves that prevent the backflow of blood. All veins except the pulmonary vein (which returns to the heart from the lungs) carry blood having low levels of oxygen. ...