The nose: lets air enter the body. Pharynx: the throat Trachea: air goes through your throat into your digestive system. The bronchi: the passages that direct air into your lungs. Lungs: an organ found in air-breathing vertebrates that exchanges oxygen and carbon dioxide with the blood.
Fun Facts: the average time an adult can hold his or her breath is between 30-60 seconds.
Each of your lungs contains about 300 million balloon-like structures called alveoli, which replace the carbon-dioxide waste in your blood with oxygen. When these structures are filled with air, the lungs become the only organs in the human body that can float on water.