Air is warmed and moisten as it moves through both the mouth and nasal passages

That is true. Your body heat attempts to bring the cool air in the outside environment to a temperature that will not shock your lungs. This is the reason that when you go outside on a cool day, you can see your breath, since the warm moist air in your lungs is condensing in the cool, dry air outside.
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avantikar avantikar · Answer 2 · 2019-10-10T11:54:06+02:00

The air moves through the nose or mouth into the body and gets moistened and warmed so as to not dry out the parts of the respiratory tract.

Further Explanation:

The organs like mouth, nose, bronchioles, trachea, pharynx, nasal cavity, and lungs make up the respiratory system. These organs work in a synchronized manner for the gaseous exchange. The gases which gets exchanged are carbon dioxide and oxygen which are exhaled and inhaled, respectively.

The air enters the body through nasal cavity or mouth. As the air moves inside, it gets warmed and moistened. This is because the air which is received by the lungs must be vaporised and is not harmful for the respiratory tract and its components. The nasal cavity is covered by cilia on the periphery and contains mucus which keeps the air moist. The solid particles are filtered from the air by the mucus and cilia which also warms up the air. The respiratory system comprise delicate tissues that are prevented by the moist air from the damage. As the air enters the nose, the moisture inside it humidifies and heats up the air. This increases the water vapor component of the air inside the noise which eventually reaches the lungs.

The mouth and the nasal cavity meet at the pharynx from where the air moves into the trachea. The trachea is a structure resembling a tube that facilitates the passage of air to the lungs through bronchioles. When the air reaches the lungs, the blood extracts the oxygen and supplies it to the other body parts. The contraction and expansion of the diaphragm help in the functioning of the lungs by forcing air to move into and out of it, respectively.

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Answer Details:

Grade: High School

Subject: Health

Chapter: Respiratory System

Keywords:

Respiratory system, mouth, nose, nasal cavity, respiratory tract, lungs, trachea, bronchioles, oxygen, carbon dioxide, exhalation, inhalation, diaphragm, contraction, expansion, air passage.