The lungs are an extraordinary organ that is separated by the heart.

They are incredibly important in respiration.

The lungs are inflatable, light, spongy, and retractable.

The lungs are separated in lobules with 2 on the left and 3 on the right.

The surfaces of the lungs are very smooth in texture.

Oxygen is essential in the metabolism of energy and byproducts of the human.

Carbon dioxide is what is considered waste for the human body and can be rather harmful.

There are many circulating veins and arteries in the lungs that allow for oxygen and carbon dioxide to be exchanged.

Oxygen comes into the lungs while inspiring.



  • The oxygen enters the Alveoli, or small sacs, of the respiratory tree.
  • This is where the exchange occurs; the oxygen crosses a very thin layer of skin from the alveoli into the blood stream.
  • Carbon dioxide does the opposite and leaves the blood and enters the alveoli to be released from the body.
  • Picture millions of grapes around a stem, the grapes are the alveoli and the stem is the blood capillaries.
  • They are adjacent to each other to help facilitate the transport.



  • Bronchioles are further outside of the alveoli.
  • They help in the final transport of oxygen to the alveoli.
  • Imagine that they are the passageways to the alveoli.
  • Outside the bronchioles is an even larger passageway – it is the Bronchus
  • This is where the trachea enters into the lungs. Each lung has a bronchus that is divided off of the Trachea.
  • Medical term regarding lungs typically begins with pulmo referring to the Latin – of the lungs – or pneumo referring to the Greek – breath.
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