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Functions of Alveoli

Referencing Styles : MLA | Pages : 1

Definition of Alveoli:

Human respiratory system consists of structures that are involved with the process of breathing. The air that is taken gets passed from a tube called trachea or in other words through the wind pipe. This inhaled air follows a definite path as it travels through the trachea to the lungs. Alveoli are defined as tiny shaped balloon structures that form the smallest passageway within the respiratory systems. These are one thick cell allowing the easy passage for oxygen and carbon dioxide in between the blood cells and alveoli. These passages are known as capillaries. Alveoli form an important part of the human respiratory system. The function of alveoli includes exchanging of oxygen and carbon dioxide molecules in bloodstreams. These tiny balloon shaped air sacs are present at the very end of the human respiratory systems and gets arranged in clusters throughout human lungs. At the end of each of these tiny alveoli some micro opening sacs are visible which are known as alveolus, the singular form of alveoli which comes out at numerous forms from one duct.

Functions of Alveoli:

The main function of alveoli at the end point of the respiratory systems starts when we inhale the air into our lungs from mouth or nose. The air that is rich in oxygen gets travelled down to the trachea and then to one of the lungs with the help of the either right or left bronchus. From this point the air gets directed through bronchioles which are smaller passages and then passes to the alveolar duct finally reaching to the individual alveolus. At this point the molecules of oxygen get diffused into a single cell within the alveolus and again into a single cell in the capillary while entering into the bloodstream. During this time, the CO2 molecules are left as a byproduct of the respiration in the cells and get diffused back into the alveolus where they get expelled out from the body via nose or mouth. During the process of inhalation, the capillaries get expanded due to the negative pressure within the chest as a result of the contraction of the diaphragm. These alveoli get recoiled back when the diaphragm relaxes.

Definition of Alveoli sacs:

The alveolar sacs are defined as small chambers of pulmonary tissue that are located at the very end of the alveolar  duct from where the smaller sacs called the alveoli  gets projected from the alveolar sacs. The alveoli are located in the lungs where most of the exchange of gases occurs. The air gets travelled from the bronchioles into the alveolar ducts and then into the alveolar sac where it again gets distributed to the projecting alveoli’s from the alveolar sac. At the end of each bronchiole, a special area gets lead to the clump of the tiny air sacs called alveoli. There are about 600 million alveoli present in human lungs that get stretched out. Each of the alveolus has a cover of a mesh of very small blood vessels known as capillaries.

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