The Respiratory System

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When humans exhale, air passes from the trachea directly into the

In humans, which structure prevents food from entering the trachea?

Which part of the human respiratory system is correctly paired with a description of its structure?

Which statement best describes the function of the respiratory passageways of a human?

Which structures in the nasal cavity remove some bacteria and dust from outside air before it enters the lungs?

A humidifier is a device that adds moisture to dry air. Which part of the human respiratory system has the same function?

In humans, most gas exchange occurs between the

An allergic reaction characterized by the constriction of bronchial tubes is known as