1 In 1990, Barack Obama was elected as the first black president of the Harvard Law Review. 2  Obama, who graduated from HLS in 1991, would later represent Illinois in the U.S Senate, and in 2008 would become the 44 th President of the United States, and the first African-American president.
Most cancers in the lung are carcinomas-cancers of epithelial cells. The top pair of images shows the normal epithelium of the bronchi. This photomicrograph is greatly enlarged. The next three pairs of images show three successive stages of abnormal changes in the bronchial epithelium commonly found in smokers.
The lungs' tertiary bronchi are also called the segmental bronchi. They branch out from the secondary bronchi, which descend from the mainstream bronchi. Lower in the lung, they become smaller and break up into the primary bronchioles. Each tertiary bronchus serves a particular bronchopulmonary segment.