Which of the areas listed below would have the lowest pO2?
A. Blood entering the right atrium
B. Blood entering the left atrium
C. Blood entering the body capillaries
D. Blood leaving the body capillaries
E. The interstitial fluid
ANSWER :
A liquid substance present between the space of cells is called as interstitial fluid, it contains most of the nutrients as well as waste materials and acts as significant space for exchange of substances between the cells and blood capillaries. It contains lowest PO2 (30-40 mmHg) level in the body. Hence the option (E) is the correct answer.
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