Oxygenated blood loses carbon dioxide in the lungs and picks up oxygen returns to left atrium of heart via four pulmonary veins a circulation route called?

The circulation route described is referred to as the pulmonary circulation. It involves the flow of oxygenated blood from the heart to the lungs and back to the heart. Here's a breakdown of the process:

1. Oxygen-Depleted Blood Leaves the Heart: Deoxygenated blood, carrying waste products like carbon dioxide, exits the right ventricle of the heart through the pulmonary artery.

2. Blood Travels to the Lungs: The pulmonary artery carries the deoxygenated blood to the lungs. Within the lungs, the blood vessels divide into tiny capillaries, creating a large surface area for gas exchange.

3. Carbon Dioxide Exchange: Inside the capillaries of the lungs, carbon dioxide diffuses out of the blood and into the alveoli (tiny air sacs) of the lungs. Simultaneously, oxygen from the inhaled air diffuses into the blood.

4. Oxygenated Blood Returns to the Heart: The now oxygen-rich blood is carried back to the heart via four pulmonary veins. These veins converge and enter the left atrium of the heart.

5. Completion of the Cycle: The oxygenated blood in the left atrium then proceeds to the left ventricle for subsequent distribution to the rest of the body through systemic circulation.

The pulmonary circulation ensures that carbon dioxide is eliminated from the bloodstream and that fresh oxygen is acquired for delivery to body tissues.