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The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?

1. B-Pulmonary artery-takes blood from heart to lungs, PO2 = 90 mm Hg
2. C-Vena Cava - takes blood from body parts to right auricle, PCO2 = 45 mm Hg
3. D-Dorsal aorta - takes blood from Heart to body Part PO2 = 95 mm Hg
4. A-Pulmonary vein - takes impure blood from body parts, PO2 = 60 mm Hg

Correct answer: B-Pulmonary artery-takes blood from heart to lungs, PO2 = 90 mm Hg

Solution

The pulmonary artery is the vessel that carries blood from the heart to the lungs for oxygenation, so its direction and function match the statement. The other options mismatch either the vessel name, the direction of flow, or the gas composition.

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