Lungs 101 | National Geographic

Lungs 101 | National Geographic

– [Narrator] Breathe in, breathe out. With every breath, the body
is replenished and cleansed. A process made possible by two of the body’s most
important and delicate organs. The lungs are two major components of the respiratory system. Soft, light, and elastic, these organs are prime for taking in and filling up with air. Each lung is subdivided into
compartments called lobes. The right lung has three, and the left lung, which is slightly smaller to accommodate the positioning of the heart, has two. This compartmentalization provides a fail-safe for the lungs, so that if one lobe is damaged, the four other lobes may remain
intact and able to function. The lobes are also connected
to separate branches, called bronchi, of the trachea, which delivers air from
the nose and mouth. These branches provide the lobes independent supplies of air. Within each lobe, the bronchi split off into
numerous smaller offshoots that end in air sacs. Known as alveoli, these sacs are responsible
for a crucial exchange of air. When a person inhales,
oxygen fills the alveoli. The alveolar walls, which
contain countless capillaries, are so thin that the oxygen
inhaled can pass through them and be absorbed by blood
cells within the capillaries. A similar transaction occurs
in the opposite direction. Carbon dioxide waste
transported in the bloodstream can pass through the alveolar walls. From there, they are expelled
with every exhalation. This exchange of gases,
known as respiration, is what gives the
respiratory system its name. Because of their intake of air, the lungs are constantly
exposed to the elements, and sometimes fall victim to them. Lung conditions may
develop, such as emphysema, which for some is caused by the
inhalation of tobacco smoke. And pneumonia, which can be caused by the inhalation of infectious organisms. All together, these
and other lung diseases are the fourth-leading cause
of death in the United States. The lungs are delicate organs. But despite their vulnerability, their anatomical design
allows them to stay strong and play a vital role in fueling the body.

100 Replies to “Lungs 101 | National Geographic”

  1. Our lungs fuel us with oxygen, the body's life-sustaining gas. To learn more, you can read on here:

  2. It's so curious! I have respiratory difficulties when I watch videos about this theme.

  3. I thought of Claire Wineland discovering this in my flow and had to watch it – for what I take for granted most of my days,..

  4. Left lung pneumonectomy for me. Was diagnosed with lung cancer at age 29. Never smoked. Am cancer free now. Take care of your lungs everyone and listen to your body 😁


  6. If you want to stop manually breathing, just hold your breath for as long as you can and then breathe slowly and lightly after.

  7. Our lungs fuel is oxygen lol, there is Oxygen avaliable on this world.? Almost anything is pollute now. Modern people gonna die at 60 even if they dont want it. Imagine new kids. Rip

  8. nice a new documentary out by National Geographic. time to have a cig , take a hit out of the bong. and maybe take a hit or two of meth

  9. You should also mention that the lungs are very delicate and what goes in doesn't come out, like a one-way street

  10. @NationalGeographic There is a lot of strong evidence to support that the air pollutants we breath also contribute to the development of vascular pathology, and hence, heart disease and stroke…. The different parts of our body don’t operate in isolation, just like how ecosystems in nature don’t operate in isolation.

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