Vein system has structure {venation}.
about veins {venous}.
From capillaries, blood goes into tubes {vein, circulation}| that have same layers as arteries but with thinner muscle layers. Valves prevent backward flow.
The first veins {venule} are small tubes.
Veins {saphenous vein}| drain leg surfaces.
Swollen veins {varicose vein}| can be in legs.
Veins {hepatic portal system}| can collect blood from spleen, stomach, pancreas, and intestines and take blood to liver.
Blood reaches largest veins {vena cava}| to enter heart, from above {superior vena cava} and below {inferior vena cava}.
Head has side neck veins {jugular vein}|.
Head has neck veins {vertebral vein} by spine.
4-Zoology-Organ-Circulation-Parts
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Date Modified: 2022.0225