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What Are the Replies Return by a Trace

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What are the replies return by a trace?


Definitions:

Alveoli

Microscopic air sacs within the lungs where the exchange of oxygen and carbon dioxide occurs.

Carbon Dioxide

A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air and is absorbed by plants in photosynthesis.

Red Blood Cells

Cells in the blood that transport oxygen throughout the body and give blood its red color.

Carbon Monoxide

A colorless, odorless, and tasteless gas that is toxic to humans and animals when encountered in concentrations above about 35 parts per million.

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