Answer – The primary function of the trachea is to transport air to and from the lungs. It also filters out impurities in the air, regulates the temperature of air before it reaches the lungs, and keeps mucus away from the lungs.

Explanation: 

The trachea, also called the windpipe, acts as a channel for airflow during inhalation and exhalation.

The trachea serves the following functions in the human body. 

• Connects larynx to bronchi: Trachea is a tube-like structure made of rings of cartilage, which help the trachea to stretch or retract as necessary. This enables the trachea to facilitate breathing by acting as a channel that connects the larynx and bronchi.
• Produces mucus to filter out debris, allergens, and other particles that enter the body through inhaled air: Specialized cells present within the trachea’s lining produce mucus to keep toxins from entering the lungs. 
• Supports oxygen intake and carbon dioxide exhalation, enabling oxygenation of blood 
• Propels mucus away from the lungs. The trachea contains hair-like structures called cilia: The cilia move in a coordinated fashion, pushing mucus and other impurities up away from the lungs and toward the throat, where they can be coughed up or swallowed.
• Maintains proper temperatures and moisture levels in the air reaching the lungs: The trachea maintains air temperature by warming and moistening the air as it passes through the respiratory tract. The moist mucous-membrane layer and the network of tissue composed of elastic and collagen fibers help to warm and moisten the air as it passes through the trachea, allowing for efficient gas exchange in the lungs

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