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.
It's a muscle. Your lungs are paired (meaning that you have two of them) The word lung actually means light so that they float.(the only place of attachment in the body is the trachea-so they literally float in the chest). The lung tissue is very porous and made of many small units called alveoli. If stretched out, their area would cover a tennis court! The large area helps the exchange of oxygen gas into the red cells of the blood which will carry the oxygen to other parts of your body. The funny shapes of the lungs are caused by the lungs molding themselves to the surrounding organs in the body. The base is concave to fit over the convex area of the diaphragm. The surface of the lungs lying against the ribs is rounded to match the curve of the ribs. The right lung is thicker and broader than the left.