Lung tissue refers to the various types of cells and structures that make up the lungs, which are responsible for carrying out respiration. The primary function of lung tissue is to exchange gases between the air we breathe and our bloodstream by facilitating oxygen uptake into the blood and carbon dioxide removal from it.
The two main types of lung tissue are alveolar (air) tissue, which forms tiny sacs called alveoli where gas exchange occurs, and bronchial (respiratory) tissue, which lines the airways leading to and within the lungs. The walls of these tubes contain smooth muscle that can contract or relax to control the flow of air in and out of the lungs.
In summary, lung tissue is a complex structure composed of various cell types and structures that work together to facilitate respiration, allowing our bodies to obtain oxygen and eliminate carbon dioxide.