
Vein
Directional Flow
Veins carry blood towards the heart, unlike arteries which carry blood away.

During the surgery, the doctor monitored the blood flow in the veins.
Medical Procedures
Veins are often used for medical procedures like drawing blood or intravenous therapy.

The nurse found a vein in my arm for the IV drip.
Visibility
Some veins can be seen under the skin, especially on the hands and arms.

You can see the blue veins clearly on his pale wrists.
Compare with
ArteryBloodlineCapillaryFlowStream
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