Question

Choose the correct sequence of tissues containing $C{O}_2$ from highest concentration level to the lowest.

• A. Pulmonary veins$-$left atrium$-$ tissues$-$right ventricle$-$ pulmonary arteries
• B. Left atrium$-$ tissues $-$ right ventricle$-$ pulmonary veins$-$pulmonary arteries
• C. Pulmonary arteries$-$ right ventricle$-$ tissues$-$ left atrium$-$ pulmonary veins
• D. Right ventricle$-$ pulmonary arteries$-$ pulmonary veins$-$left atrium$-$ tissues
• E. Tissues$-$pulmonary veins$-$pulmonary arteries$-$left atrium$-$right ventricle

Answer 1

Answer: (D)

Right ventricle$-$ pulmonary arteries$-$ pulmonary veins$-$left atrium$-$ tissues

The deoxygenated blood reaches the right atrium first and then to the right ventricle. From there the deoxygenated blood reaches the lungs through the pulmonary arteries. In lungs, the deoxygenated blood gets converted into oxygenated blood. After this, the blood from the lung travels through the pulmonary vein to reach the left atrium. This oxygenated blood then reaches the tissues of the entire body by aorta.