In which location would you expect the oxygen concentration to be the lowest?

The location where oxygen concentration is lowest is : Within tissues ( D)

Oxygen concentration in the body

The oxygen concentration in the body is higher in organs closer to the heart and organs directly involved in respiratory activities, organs such as lungs and the blood and environment surrounding these organs will have a high concentration of oxygen. while organs farther from the lungs and heart such as the tissues will have a lower concentration of oxygen.

Hence we can conclude that The location where oxygen concentration is lowest is : Within tissues ( D)

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The options related to your question is missing attached below are the missing options

a. blood b. environment c. lungs d. within tissues e. heart

The location that should have lowest oxygen concentration would be the tissue because it is the furthermost location.
Other location with lowest oxygen concentration should be in the right part of the heart. It is when all unoxygenated blood pooled before going to the lungs. But the left part of the heart will have highest oxygenated blood, so it's ambiguous.

High oxygen concentration should be found in the environment, lungs, and the blood.

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