Answer
Lungs - "The human body posses to similar structures for inhalations and exhalation of air in the body". As lungs are in a pair and has the capacity of about 5 liters in total".
When the lungs face cold or humid air they operate as follows.
Explanation:
Releasing Histamine
lungs when faces cold air it release the chemical histamine in it so it can contract the soft muscle and contract the air ways.
Humidifying the air
As the human body has an inbuilt system to humidify the air up to 100 percent and 96' F in temperature for better operation.
