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How do the Lungs Work?

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  • Written By: Michael Anissimov
  • Edited By: Bronwyn Harris
  • Last Modified Date: 27 November 2016
  • Copyright Protected:
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    Conjecture Corporation
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Lungs provide our body with the oxygen it needs to generate energy in the form of adenosine triphosphate (ATP). ATP is the body’s energy currency, and it is necessary for all energy-consuming cellular processes. Over the course of a lifetime, a person may use their lungs to breathe over a billion times. Animals breathe in oxygen and exhale carbon dioxide, the opposite of plant respiration.

The lungs are the central component of the respiratory system, which is used for breathing. Fresh air comes in through the mouth, down the trachea (windpipe), into the lungs through cartilaginous pathways called bronchi and bronchioles, where it is absorbed by tiny air sacs called alveoli. Alveoli are about 0.05 mm in diameter, but swell to 0.1 mm during inhalation. By comparison, a typical cell is about 0.01 mm in size.

The entire process of inhalation is driven by the diaphragm, a large muscle below the lungs. When the diaphragm is at rest, the lungs open wide, drawing in oxygen. When the diaphragm tenses up, the lungs are compressed, ejecting carbon dioxide. This process repeats continuously, even while we are asleep.

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The alveoli exist in a finely branching structure, starting from the large windpipe and continuing down to individual air sacs. Because of this branching structure, they have a very large combined surface area, about 750 – 1,000 square feet (70 – 90 square meters). This is similar in area to a football field, although the lungs themselves are only as large as a couple of steaks.

A network of capillaries — fine blood vessels — cover the alveoli. Oxygen from the alveoli diffuse into the bloodstream, which then travels to the heart, where it gets pumped around the body. Oxygenated blood has a bright red color, while deoxygenated blood has a bluish hue.

The lungs are not only for breathing. They also play a role in filtering the blood and shielding the heart, which is almost surrounded by them.

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Discuss this Article

anon86874
Post 6

why are the walls of the blood vessels around the air sacs very thin?

anon64745
Post 5

how do your alveoli work?

anon40853
Post 4

how to improve the hemoglobin?

anon38350
Post 3

How does one lung work if the other one has been damaged in some way?

anon36738
Post 2

what is the treatment for lungs cell rejenuvation?

anon9862
Post 1

How long does the lungs take to heal from the damage caused by smoking.

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