The veins of vertebrates
A) carry blood towards the heart.
B) carry oxygenated blood.
C) contain blood at high pressure.
D) have thick elastic walls.
E) are muscular to create pumping action.

Question

Quizplus · Accepted Answer

Veins are blood vessels that carry blood towards the heart, which is their primary function. Unlike arteries, which carry blood away from the heart and often contain oxygenated blood, veins mostly carry deoxygenated blood from the tissues back to the heart, except for the pulmonary and umbilical veins. Veins also have lower blood pressure compared to arteries and have thinner walls with less elasticity, relying on skeletal muscle contractions and valves to help move blood back to the heart.

The Veins of Vertebrates