What anatomy is labeled as letter E in the image below? 
Definitions:
Nasal Cannula
A device used to deliver supplemental oxygen or airflow to a patient in need of respiratory help, consisting of a lightweight tube with two prongs for insertion into the nostrils.
Hypoxemia
A condition characterized by an abnormally low concentration of oxygen in the blood.
Hemoglobin Levels
The concentration of hemoglobin in the blood, indicative of the blood's ability to carry oxygen.
Blood PH
A measure of acidity or alkalinity in the blood, with a normal range usually between 7.35 and 7.45.
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