state the role of diaphargm and alveoli
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Answer:
The diaphragm, located below the lungs, is the major muscle of respiration. ... This contraction creates a vacuum, which pulls air into the lungs. Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.
Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
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Answer:
ROLE OF DIAPHRAGM
The diaphragm is a large muscle that sits under the lungs. When you inhale, the diaphragm contracts which provides more space for the kings to expand in the chest cavity. Alongside the diaphragm, the muscles between and around the ribs tighten to move the ribcage up and out to provide even more space.when you exhale, the diaphragm expands, forcing the air from you lungs. As the diaphragm retracts, the intercostal muscles (around the ribs) loosen which allows the ribcage to move back to its original position. This exerts a little bit more pressure that helps to empty the lungs as well.
ROLE OF ALVEOLI
***Role in the respiratory system.
The final branches of the respiratory tree, alveoli are where oxygen from the air enters your blood, and carbon dioxide from your body is expelled back into the air.
***How they work.
Air enters the body through the nose or mouth, passes through the larynx, down the trachea, and into our lungs. Once it is in your lungs, air goes through a maze of smaller and smaller bronchial tubes until it reaches clusters of tiny sacs the alveoli. In appearance they are somewhat like bunches of grapes.
***Size and where they live.
These alveoli are tiny, but your lungs are simply packed with them an estimated three hundred million per lung, all required to ensure that your body gets the oxygen it needs.
***Once it is in your lungs, the blood has to get into your blood. The alveoli are the primary gas exchange units of the lung. Quite simply, they are the point where the gas-blood barrier is thin enough to permit rapid gas exchange.
***To get into the blood, oxygen is diffused through the alveolar epithelium, a thin interstitial space, and the capillary endothelium.
***Role also has to be reversed.
That is only half the process of course this process also has to work in reverse in order to allow CO2, a waste product carried by the blood, to be expelled back into the lungs, and thus out of the body when we exhale.
Explanation:
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