Question

Blood vessels that bring oxygenated blood to the left auricle.
A. Precaval vein
B. Post caval vein
C. Pulmonary vein
D. Pulmonary artery

Answer 1

Hint: Heart is the key organ for the circulatory system; it is the hollow muscle that lies at the center of the circulatory system and is responsible for transport of oxygen and carbon dioxide.

Complete Answer:
- Heart is made up of four chambers: Two chambers at the top, the left and right atriums, these are thin-walled chambers that receive blood from the veins and the two chambers at the bottom left and right ventricles which have thick-walled chambers that forcefully pump blood out of the heart.
- The chambers are separated by valves which ensure that blood flows in the correct direction.There are four valves in the heart. Between the right atrium and the right ventricle the valve present is the tricuspid valve.
- The valve present between the left atrium and the left ventricle is the mitral valve. The aortic valve is present between the left ventricle and the aorta and the pulmonary valve is present between the right ventricle and the pulmonary artery.
- The pulmonary veins are large blood vessels that receive oxygenated blood from the lungs to deliver to the rest of the body. The blood first passes through the pulmonary valve as then ejects into the pulmonary arteries.
- Oxygen-rich blood from the lungs is circulated back to the heart through the pulmonary veins that drain into the left atrium.

Therefore, the correct answer is option C Pulmonary veins.

Additional information:
- When any part of the heart-lung circuit gets damaged or blocked it leads to pulmonary vascular disease.
- There are different types of pulmonary vascular diseases: Pulmonary venous hypertension is a condition where blood pressure in teases in the pulmonary vein; Pulmonary embolism arises due to the blockage in the pulmonary arteries; Formation of a blood clot in the lungs leads to Chronic thromboembolic disease; Pulmonary arterial hypertension is caused by increased blood pressure in the pulmonary arteries.

Note: The veins usually carry deoxygenated blood from tissues back to the heart, but the pulmonary veins are among the few veins that carry oxygenated blood.