In computer networks and telecommunications, a dedicated line is a communications connection or other hardware resource dedicated to a certain application or use. This is different than a shared connection such as a telephone network or the Internet.
Carbon dioxide, a waste product of metabolism, travels from the blood to the alveoli, where it can be exhaled. Between the alveoli is a thin layer of cells called the interstitium, which contains blood vessels and cells that help support the alveoli. The lungs are covered by a thin tissue layer called the pleura. The same kind of thin tissue lines the inside of the chest cavity -- also called pleura. A thin layer of fluid acts as a lubricant allowing the lungs to slip smoothly as they expand and contract with each breath.
Transcript of Lungs Specialized Cells. Lungs Cuboidal Cells Lung Cancer Squamous Epithelial Cells Flat, tile-like cells with irregular cell boundaries. Cover 95 percent of the alveolar surface area. Two large, sponge-like organs that are used to breath. Where blood picks up oxygen and releases carbon dioxide. A fluid in the lungs that helps keep them moist, controls fluid levels, and replaces injured cells.