Respiration is the act of breathing:
The respiratory system is made up of the organs involved in the exchange of gases, and consists of the:
The upper respiratory tract includes the:
The lower respiratory tract includes the:
The lungs take in oxygen, which the body's cells need to live and carry out their normal functions. The lungs also get rid of carbon dioxide, a waste product of the cells.
The lungs are a pair of cone-shaped organs made up of spongy, pinkish-gray tissue. They take up most of the space in the chest, or the thorax (the part of the body between the base of the neck and diaphragm).
The lungs are enveloped in a membrane called the pleura.
The lungs are separated from each other by the mediastinum, an area that contains the following:
The right lung has three sections, called lobes. The left lung has two lobes. When you breathe, the air:
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