Question

Pulmonary veins carries _____
a. Impure blood
b. Pure-blood always
c. Impure blood sometimes
d. Mixed blood

Answer 1

Hint: The Pulmonary vein carries oxygenated blood. The pulmonary circulation is different from systemic, in that within the pulmonary circulation veins carry oxygenated blood, whereas the arteries carry deoxygenated blood.

Complete answer:
- The largest pulmonary are the four main pulmonary veins, two from each lung that drains into the left atrium. The pulmonary veins are part of pulmonary circulation.
- Two main pulmonary veins emerge from each lung hilum, receiving blood from three or four bronchial veins and drain it into the left atrium.
- The pulmonary veins are fixed to the pericardium travel alongside the pulmonary arteries.
- The right main pulmonary veins pass behind the right atrium and superior vena cava the left in front of the descending thoracic aorta.
- The number of pulmonary veins opening into the left atrium can vary between three and five.
- The pulmonary vein carries pure blood that is oxygenated blood from the lungs into the left atrium of the heart where it is returned to the systemic circulation.
- Pulmonary vein carries blood rich in oxygen to the left side of the heart.
- This differentiates the pulmonary veins from other veins in the body, which carry deoxygenated blood
- Each pulmonary vein is linked to a network of small capillaries in the alveoli of each lung. Alveoli are the tiny air sacs within the lungs where oxygen and carbon dioxide are exchanged. These capillaries join together to form a single blood vessel from each lobe of the lung.

Hence, The correct answer is option (B).

Note: Pulmonary vein brings freshly oxygenated blood from the lungs to the left atrium, the blood travels to the left ventricle from where it is ejected to supply oxygen and nutrients to all tissues of the body.