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.
1 Make connections between the lung DVD and structure of lungs. 2  Tissue â a group of similar cells specialised to carry out the same function. 3  Organ â a structure made up of different kinds of tissue. 4  E.g. Identify the differences between squamous epithelium, ciliated epithelium goblet cells. 2  Make connections between the lung DVD and structure of lungs. 3  Tissue â a group of similar cells specialised to carry out the same function. 4  Organ â a structure made up of different kinds of tissue.