The bronchial tubes are air passages that branch off from the trachea, or windpipe, and lead into the lungs. They are part of the respiratory system and help transport air to and from the lungs. The bronchial tubes divide into smaller branches called bronchioles, which further distribute air throughout the lung tissue. These tubes are lined with mucus and tiny hair-like structures called cilia, which help trap dust and germs, keeping the airways clear. Proper functioning of the bronchial tubes is essential for effective breathing and overall lung health, as they play a crucial role in the exchange of oxygen and carbon dioxide in the body.