Question

All veins have deoxygenated blood except
A. Renal artery
B. Hepatic vein
C. Hepatic portal vein
D. Pulmonary veins

Answer 1

Hint: Pulmonary arteries and veins are a unique type of blood vessels in the type of blood they carry. They carry different blood as compared to normal arteries and veins. These blood vessels are a part of the pulmonary circulation.

Complete answer: Pulmonary arteries carry deoxygenated or oxygen-poor blood towards the lungs from the right ventricle of the heart for the process of oxygenation. Whereas, pulmonary veins carry oxygenated or oxygen-rich blood from the lungs to the left atrium of the heart. They are part of the pulmonary circulation system. It differentiates pulmonary veins and arteries from other veins and arteries in the body. The largest pulmonary veins help in draining oxygenated blood to the left atrium from the lungs. The four pulmonary veins that drain from the two lungs are as follows:
a) Right superior vein - It drains the right upper and middle lobes of the lung.
b) Right inferior vein - It drains the right lower lobe of the lung.
c) Left superior - It drains the left upper lobe of the lung.
d) Left inferior - It drains the left lower lobe of the lung.
Hence, the correct answer is option D.

Note: The right atrium of the heart receives the blood from the superior and inferior vena cava. The heart itself has to get oxygenated, which is done by coronary arteries. The human heart has four chambers, the number differs from organisms to organisms. For example; frogs and lizards have a three-chambered heart. The largest artery in the systemic circulation of the human body is the aorta.