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In Order to Test the Effectiveness of a Drug Called

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In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels,9 heart patients' cholesterol levels are measured before they are given the drug.The same 9 patients use XZR for two continuous months.After two months of continuous use,the 9 patients' cholesterol levels are measured again.The comparison of cholesterol levels before vs.after the administration of the drug is an example of testing the difference between two ____________


Definitions:

Olfactory Epithelium

Epithelium of the olfactory recess containing olfactory receptors.

Nasal Cavity

The large air-filled space behind the nose, involved in breathing, smell, and mucus production to filter air entering the respiratory system.

Nasolacrimal Ducts

The ducts that carry tears from the lacrimal sacs of the eyes into the nasal cavity, facilitating tear drainage.

Cricoid Cartilage

Most inferior laryngeal cartilage.

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