Definition: The term "alveolar" in medical terminology refers to any structure within the lungs, particularly those that are located at the lower end of the bronchi. This area includes alveoli - tiny air-filled sacs that are surrounded by a layer of thin smooth epithelium called alveolus (lung lining). Alveoli are responsible for gas exchange in the lungs, where oxygen diffuses from the blood and cells to the alveoli and carbon dioxide diffuses out of the alveoli into the bloodstream. The word "alveolar" itself comes from Old Greek alvo-, which means "to open," and its root is the same as the Hebrew alvah (literally 'opening'). This term is derived from the Greek word for a small air sac, alveo, which implies a collection of tiny air-filled spaces within the lung. The specific name of an alveolar structure is usually given by reference to how it opens and closes. The word "alveolar" is one of two major terms in medicine used to describe structures located at the lower end of bronchi or the lungs. This term, however, can be confusing because while it describes a group of tiny air-filled sacs within the lung, there are also many other types of alveoli that make up the lung and their functions. The exact number and variety of alveolar structures in the lungs can vary from person to person depending on factors such as genetics, age, gender, and environmental factors like smoking. In general, alveoli contribute significantly to gas exchange between the alveoli and the blood, facilitating breathing by providing a conduit for oxygen to enter the bloodstream and carbon dioxide to leave it.
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