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Esophageal cancer can also spread to the lungs, liver, stomach, and other parts of the body. There are two major types of esophageal cancer: 1  Squamous cell carcinoma. 2  This type of esophageal cancer starts in squamous cells that line the esophagus. 3  It usually develops in the upper and middle part of the esophagus.
They belong to the respiratory system. This system also includes the nose and the trachea. The main goal of the respiratory system is to provide gas exchange between the blood â¦ and the environment. How Lungs Work: Understanding COPD Pathophysiology COPD is a largely preventable disease that is one of the top five causes of death in the United States. 2  Worldwide, statistics are not much better than that.