The right ventricle pumps deoxygenated blood to the lungs, while the aorta and pulmonary vein carry oxygen-rich blood in the human vascular system.​

Option Analysis

I. Right Ventricle
Deoxygenated blood enters the right atrium from the body via the vena cava and flows into the right ventricle, which pumps it to the lungs through the pulmonary artery for oxygenation. This chamber handles oxygen-poor blood exclusively.​

II. Aorta
Oxygen-rich blood from the left ventricle enters the aorta, the body’s largest artery, distributing it to systemic circulation for oxygen delivery to tissues. All arteries except the pulmonary artery carry oxygenated blood.​

III. Pulmonary Vein
Pulmonary veins are the exception among veins, transporting oxygen-rich blood from lung alveoli back to the left atrium after gas exchange. Four pulmonary veins deliver this oxygenated blood.​

The human vascular system efficiently separates oxygen-rich blood from deoxygenated blood through the heart’s four chambers and major vessels. Understanding which parts—like the aorta and pulmonary vein—handle oxygen-rich blood is crucial for exams like CSIR NET Life Sciences, focusing on circulatory pathways.​

Blood Flow Pathway

Deoxygenated blood returns via vena cava to the right atrium and right ventricle, then exits to lungs via pulmonary artery. Lungs oxygenate it, and pulmonary veins return oxygen-rich blood to the left atrium, left ventricle, and finally the aorta for body distribution.​

• Right side (atrium, ventricle): Processes oxygen-poor blood.​

• Left side (atrium, ventricle): Manages oxygen-rich blood.​

• Aorta branches supply organs with oxygenated blood.​

• Pulmonary veins uniquely carry oxygenated blood as veins.​

Exam Relevance

For competitive biology exams, remember: only the aorta (systemic artery) and pulmonary veins contain oxygen-rich blood among the options. The right ventricle never does, making option D correct.​