lung

The lungs are the organs in your chest that help you breathe. They are like two soft, spongy parts filled with tiny air sacs where oxygen moves into your blood and carbon dioxide moves out. They keep working all the time, even when you are asleep or not thinking about breathing. A runner needs healthy lungs to keep going, while someone with pneumonia may find it hard to take in enough air.

We usually use this word when talking about breathing, health, exercise, or illness. It can also appear in a more expressive way. If someone is said to have "strong lungs," it often means they can breathe well, shout loudly, or sing with power.

The lungs are the primary organs of respiration in humans and many other animals. Located within the chest cavity, they're responsible for taking in oxygen from the air we breathe and expelling carbon dioxide—a waste product of our body's processes. Imagine them as two large, sponge-like structures filled with millions of tiny air sacs called alveoli. These alveoli are where the crucial exchange of gases happens: oxygen moves into the bloodstream, while carbon dioxide moves out to be exhaled.

The health of your lungs is vital for overall well-being. Conditions like asthma, bronchitis, and pneumonia can affect lung function, making it difficult to breathe. Smoking is particularly damaging to the lungs, increasing the risk of serious diseases like emphysema and lung cancer.

Beyond their biological role, "lung" sometimes appears in figurative language. You might hear someone say they "had the wind knocked out of their lungs" after a sudden shock or impact. Historically, the term was also used metaphorically to describe the capacity for endurance or vitality—a person with strong "lungs" was seen as robust and energetic, often referring to a singer or speaker with great power and range. So whether you're thinking about the mechanics of breathing, the importance of healthy habits, or even a bit of old-fashioned imagery, the lungs are fundamental to life itself—the very breath that sustains us.