What Are the Structures of the Lungs?
Your lungs are a life-sustaining marvel, efficiently connecting the human body with the oxygen essential for functioning. Of all your internal organs, the lungs are the only ones to endure regular exposure to the outer environment, with healthy adults drawing in about 3,000 gallons of air daily, according to the U.S. Environmental Protection Agency. From this inhaled air, the lungs cull oxygen and deliver it to the bloodstream for distribution to the body’s organs and tissues. Gaseous waste in the form of carbon dioxide is collected from the tissues and exhaled. This respiratory process is a team effort between the varied structures of the lungs 2.
If you are experiencing serious medical symptoms, seek emergency treatment immediately.
Anatomically Speaking
The lungs are located inside of your chest, one on each side. Each lung is divided into sections called lobes. Your right lung has three lobes, and the left has just two to allow room for the heart.
Air Travel
Characteristics of Healthy Lungs
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The respiratory system, of which the lungs form the foundation, is made up of an intricate network of tubes. When air enters the lungs by way of the mouth or nose, it is warmed in the throat before traveling down the windpipe, or trachea. At the bottom of the trachea, air is split between two passages -- the right and left main bronchus -- each of which leads into a lung.
Strictly Structures
The main bronchi enter the lungs and successively branch into thousands of smaller pathways called bronchioles. At the end of the bronchioles are air-filled structures called alveoli 2. The number of these spongy sacs is legion; you have about 300 million in each of your lungs, enough to cover an entire tennis court, says the American Thoracic Society 2. Inside the alveoli, an essential exchange of gas occurs as oxygen passes through their filmy walls into tiny blood vessels called capillaries. These minute structures transfer the oxygen to pulmonary veins, which then carry the oxygenated blood to the heart.
- The main bronchi enter the lungs and successively branch into thousands of smaller pathways called bronchioles.
- Inside the alveoli, an essential exchange of gas occurs as oxygen passes through their filmy walls into tiny blood vessels called capillaries.
The Delicate Side
What Are the Steps of Breathing?
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The structures of the lungs are efficient, but delicate; when exposed to irritants or infection, they reveal their vulnerability. Smoking, smog and exposure to mildew and allergens can inflame and constrict bronchial tubes. Pneumonia, influenza and cancer can disrupt the respiration process and progress to the point that longevity and quality of life are diminished. Your family physician or a pulmonary specialist can provide appropriate treatment and guidance to help keep your lung structures healthy and keep you breathing easy.
- The structures of the lungs are efficient, but delicate; when exposed to irritants or infection, they reveal their vulnerability.
- Pneumonia, influenza and cancer can disrupt the respiration process and progress to the point that longevity and quality of life are diminished.
Related Articles
References
- ATSJournals: Pulmonary Immunobiology and Inflammation in Pulmonary Diseases; 2000
- American Thoracic Society: Standards for Quantitative Assessment of Lung Structure
- National Cancer Institute SEER Training Modules. Anatomy of the lung.
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- The Lung Association. How the lungs work. December 10, 2016.
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- NIH U.S. National Library of Medicine Genetics Home Reference. Idiopathic pulmonary fibrosis. April 28, 2020.
- American Lung Association. Learn about sarcoidosis. February 27, 2020.
- Hoeper MM, Ghofrani HA, Grünig E, Klose H, Olschewski H, Rosenkranz S. Pulmonary hypertension. Dtsch Arztebl Int. 2017;114(5):73-84. doi:10.3238/arztebl.2017.0073
- Bĕlohlávek J, Dytrych V, Linhart A. Pulmonary embolism, part I: Epidemiology, risk factors and risk stratification, pathophysiology, clinical presentation, diagnosis and nonthrombotic pulmonary embolism. Exp Clin Cardiol. 2013;18(2):129-38.
- American Lung Association. Lung capacity and aging. March 11, 2020.
- MedlinePlus. Lung function tests.
Writer Bio
Libby Swope Wiersema is a veteran health care journalist and features editor for newspapers and magazines. She writes and edits health, fitness, nutrition and travel features for multiple media outlets.