Oxygen transportation in a human body takes place through I. Blood II. Lungs III. Tissue The correct sequence of transportation is
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UPSC Civil Services preparation
- AI, II, III
- BIII, I, II
- CII, I, IIICorrect
- DI, III, II
Explanation
The correct sequence is II, I, III because it follows the physiological path oxygen takes from the external environment to the cells of the body.
First, oxygen enters the Lungs II through inhalation. From the alveoli in the lungs, oxygen diffuses into the Blood I, where it binds to hemoglobin. The circulatory system then transports this oxygenated blood throughout the body. Finally, the oxygen is delivered to the individual Tissues III and cells for cellular respiration. Therefore, the logical flow is Lungs to Blood to Tissue.
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