the paouch like air secs at the smallest lenchioles is called alveoli.the walls of alveoli are very thin and they are sorrounding thin blood capllaries .it is in alveoli exchange of gaseouse takes place there are so many alveoli in blood so they provides very larges surface srea for cxchanges of gaseouse
In the lungs, exchange of gases occurs in the alveoli(sing: alveolus).
The actual exchange of gases occurs in the alveoli
exchange of gases in respiratory
The alveoli are small sacs within the lungs where gas exchange occurs. They are located at the ends of bronchiole branches.
lower exchange rate,takes longer for gases to diffuse
Oxygen and carbon dioxide
The difference in the partial pressure of the gases in the blood coming to the lungs and the alveoli mediated the gas exchange. Without this difference we wont be able to breathe. Diaphragm in the thoracic cavity plays an important role in exchange of these respiratory gases.
The exchange of gases between blood and air occurs in the alveoli of the lungs. Oxygen from the air diffuses into the bloodstream, while carbon dioxide from the blood diffuses into the air in the alveoli to be exhaled.
Lungs consist of a series of tubes of ever-decreasing size, which carry air to and from the blood at the gas exchange surface in the 'alveoli'. These alveoli are microscopic hollow balls (at the ends of thousands of tubes) which are covered on the outside by blood capillaries (extremely narrow blood vessels) and a thin layer of mucus on the inside, which increases the speed at which the air diffuses into and out of the blood. The spherical shape of the alveoli, the microscopic width of these hollow balls (allowing more to fit within a small space) and the density of blood vessels inside the lungs all maximise the surface area. A last, important note: the lungs are NOT 'designed'; human lungs have evolved from simple gas exchange organs like the lungs of lungfish, becoming increasingly complex over a very long period of time.
Lungs consist of a series of tubes of ever-decreasing size, which carry air to and from the blood at the gas exchange surface in the 'alveoli'. These alveoli are microscopic hollow balls (at the ends of thousands of tubes) which are covered on the outside by blood capillaries (extremely narrow blood vessels) and a thin layer of mucus on the inside, which increases the speed at which the air diffuses into and out of the blood. The spherical shape of the alveoli, the microscopic width of these hollow balls (allowing more to fit within a small space) and the density of blood vessels inside the lungs all maximise the surface area. A last, important note: the lungs are NOT 'designed'; human lungs have evolved from simple gas exchange organs like the lungs of lungfish, becoming increasingly complex over a very long period of time.
alveoli
permits the easy exchange of gases