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8

NCCN Guidelines for Patients

®

:

Lung Cancer Screening, Version 1.2017

1

Why get screened?

The lungs

The lungs

The lungs are a pair of organs in the chest that are

vital to life. The lungs move important gases in and

out of the blood. You breathe in oxygen and let out

carbon dioxide (a toxic gas) from the body.

The lungs have sections called lobes. The left lung

has 2 lobes and the right lung has 3 lobes. A thin

layer of tissue (membrane) surrounds the lungs

called the pleural membrane.

The two large breathing tubes that go from the

windpipe (trachea) to the lungs are called bronchi.

A single tube is called a bronchus. Then inside of

the lungs are small tubes (bronchioles) and small air

sacs (alveoli).

See Figure 1

.

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www.nucleusinc.com

Figure 1. The lungs

The lungs have sections called lobes. The left lung has 2 lobes and the right lung has 3 lobes.