What are the respiratory bronchioles?

Respiratory bronchioles are the final branches of the airways that enter the lungs that end with alveoli, tied spherical bags, inside which the oxygen and carbon dioxide change. If these airways were compared with a bunch of cauliflower, bronchus would be a large stem, bronchiols would be smaller strong limbs branching from the stem, the terminal bronchioles would be even smaller divisions of these limbs. All bronchioles perform inhaled air towards the alveoli and respiratory bronchioles are the last pass for this air. They also participate in the exchange of gases between this final airspace and blood that penetrates alveoli with small capillary beds. This oxygen blood is another cycled back into the heart's vein and then pumped into the body to distribute oxygen and other nutrients. Once the body tissues receive oxygen and release carbon dioxide as a metabolic by -product, the deoxygenated blood returns to the heart when the cycle begins again. In addition, carbon dioxide is eliminated from bloode in the lungs and released from the body in exhaled air, completion of gaseous replacement.

Inhaled air travels from the nasal passages or mouths on the pharynx or neck, through the larynx or voicemail and into the trachea or trachea. Between two lungs, the trachea is divided into two airways - these are bronchi. Bronchi, almost completely contained in the lungs themselves, is prolonged to the organ before starting their subdivision. Bronchioles are the first branches and are responsible for air guidance to an individual unit in the lungs known as pulmonary lobules. Each bronchiole is divided into several terminal bronchiols, which further perform inhalation air and end or ending in respiratory bronchiols, inputs to alveoli.

respiratory bronchioles, although very small, are made up of several layers of tissue in the walls. The innermost epithelial layer consists of two types of cells: CilovanCells that filter air and Clara cells that eliminate substances called glycosaminoglycans, as well as specific proteins that protect epithelium or internal lining and fight the disease. Below this layer is a lamina propria, a layer of connective tissue that holds the epithelium to the wall of the smooth muscles under the muscle, which drives the air further. On the outer side of the smooth muscles is adventia, another layer of connective tissue that is exposed to lumen, space inside the lungs.