What are the four structures of the lungs

Since this is not my area of expertise, I searched Google under the key words "four structures of the lungs" to get these possible sources:

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The four structures of the lungs are:

1. Bronchi: These are the main airways that branch off from the trachea (windpipe) into the lungs. They further divide into smaller tubes called bronchioles.

2. Alveoli: These are tiny air sacs located at the end of the bronchioles. They are responsible for the exchange of oxygen and carbon dioxide with the bloodstream.

3. Capillaries: These are tiny blood vessels that surround the alveoli. They allow for the exchange of gases between the alveoli and the bloodstream.

4. Pleura: The pleura is a thin, double-layered membrane that surrounds each lung. It helps to protect and lubricate the lungs, allowing them to expand and contract with minimal friction during breathing.

To find this information, you can either consult a reliable anatomy textbook, search for reputable online sources such as medical websites or academic journals, or consult with a healthcare professional. These sources will provide detailed descriptions of the structures of the lungs along with illustrations or diagrams to aid in understanding.