Multiple choice

Oxygenated blood reaches heart by ________.

  1. pulmonary artery

  2. pulmonary vein

  3. aorta

  4. vena cava

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pulmonary artery carries de-oxygenated blood to the lungs, where it is supplied with fresh oxygen, and carbon-dioxide is removed. The blood, which is now rich in oxygen, returns to the heart through the pulmonary veins.