Bronchus

A bronchus (plural bronchi, adjective bronchial) is a caliber of airways in the respiratory tract that conducts air into the lungs. No gas exchange takes place in this part of the lungs.

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The trachea (windpipe) divides into two main bronchi, the left and the right. These subdivide in two (left lung) or three (right lung) bronchi that each serve one lobe. The bronchi divide several more generations until they become bronchioles. There is a bronchus going to each segment of each lobe of the lung. Bronchi are generally greater than one millimetre in diameter.

Respiratory tract: In humans the respiratory tract is the part of the anatomy that has to do with the process of respiration or breathing....

Gas exchange: Gas exchange or respiration takes place at a respiratory surface - a boundary between the external environment and the interior of the body. For unicellular organisms the respiratory surface is simply the cell membrane, but for large organisms it usually is carried out in respiratory systems....

Trachea: The trachea (IPA /'treikiə/), or windpipe, is a tube extending from the larynx to the bronchi in mammals, and from the pharynx to the syrinx in birds, carrying air to the lungs. It is lined with ciliated cells which push particles out and cartilage rings which reinforce the trachea and prevent ...