ANATOMY

Detailed explanation-1: -At the end of each bronchiole are tiny air sacs called alveoli. This is the place where the exchange of oxygen and carbon dioxide actually happens.

Detailed explanation-2: -The pharynx, larynx, and early generations of the airways leading to the lungs do not participate in gas exchange. The airways are lined with goblet cells that produce mucus and a ciliated epithelium that constantly moves mucus toward the mouth.

Detailed explanation-3: -The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out. Oxygen breathed in from the air passes through the alveoli and into the blood and travels to the tissues throughout the body.

Detailed explanation-4: -When you inhale through your nose or mouth, air travels down your pharynx (back of your throat), passes through your larynx (voice box) and into your trachea (windpipe). Your trachea is divided into two air passages called bronchial tubes. One bronchial tube leads to your left lung, the other to your right lung.

Detailed explanation-5: -Although all parts of the tracheal system allow oxygen to diffuse out to the tissues and carbon dioxide to enter, most of the gas exchange occurs across the smaller tracheae and tracheoles because they are the parts of the system in intimate contact with cells.