SAMANTHA ELMHURST / SCIENCE PHOTO LIBRARY SAMANTHA ELMHURST / SCIENCE PHOTO LIBRARY
Illustration of the human body showing the lungs. The trachea (windpipe) leads from the larynx (voicebox) to the lungs (pink) where it splits into the two main bronchi. Across the bottom of the lungs is the thoracic diaphragm, a sheet of muscle that separates the thoracic (chest) cavity from the abdominal cavity.
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