What is the correct answer to the expression below? 
Definitions:
Extracellular
Located or occurring outside the cells of an organism.
Nasogastric Tube
A tube that is inserted through the nose into the stomach for feeding or medication administration.
Arterial Blood Gas
A test measuring the amounts of oxygen and carbon dioxide in the blood from an artery, used to assess lung function and blood gas exchange.
Respiratory Rate
The number of breaths a person takes per minute, a critical vital sign indicating respiratory health or distress.
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