Air is expelled from the alveoli, as well as the lungs in general, during exhalation when the diaphragm relaxes and rises up. This creates pressure on the thoracic cavity, and since there is more air pressure inside than outside, the air is exhaled to relieve the pressure.
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There are two phases in one breath: inhalation and exhalation. During inhalation, air is drawn into the lungs, and during exhalation, air is expelled from the lungs.
During inhalation, oxygen from the air is diffused from the alveoli in the lungs into the bloodstream, binding to hemoglobin in red blood cells for transport to cells. At the same time, carbon dioxide produced by cells is released into the alveoli and expelled during exhalation. This exchange is facilitated by differences in partial pressure between the alveoli and the blood, as well as the high surface area and thin walls of the alveoli for efficient gas exchange.
The lipoprotein film covering the alveoli serves to reduce surface tension, preventing the collapse of the alveoli during exhalation and promoting efficient gas exchange in the lungs.
Nasal cavity Pharynx Larynx Trachea Bronchus Bronchioles Alveoli
Type 2 alveoli cells secrete surfactant, which helps to reduce surface tension in the alveoli. This allows for easier expansion of the alveoli during inhalation and prevents them from collapsing during exhalation, promoting efficient gas exchange.
The respiratory system exchanges oxygen and carbon dioxide with the air through the process of breathing. Oxygen is taken in through the lungs and carbon dioxide is expelled during exhalation. The exchange occurs in the alveoli, which are tiny air sacs in the lungs.
Oxygen enters the blood through the alveoli in the lungs during inhalation, where it diffuses into the bloodstream. Carbon dioxide leaves the blood in the same location, diffusing from the blood into the alveoli to be exhaled during exhalation.
using diffusion and osmosis.
External respiration is the exchange of oxygen and carbon dioxide between the lungs, body and the outside environment; the breathing process known as inhalation and exhalation. Upon inhalation, air enters the body and is warmed, moistened, and filtered as it passes to the alveoli of the lungs. Oxygen diffuses from the alveoli to the bloodstream, then into the red blood cells. Simultaneously, carbon dioxide in the blood is diffused from the blood to the alveoli, and exhalation expels the carbon dioxide from the alveoli.
The breathing organ of our body are lungs. IT plays an important role in exchange of gases between the blood and air and the gas is oxygen and carbon dioxide.Respiratory surface alveoli are present in the lungs.Air enters alveoli during inhalation. Oxygen of inhaled air diffuses into blood while carbon dioxide of blood passes out into alveoli . Foul air is passed out of lungs during exhalation.
Type II alveolar cells in the lungs secrete surfactant, which is a specialized fluid that lowers surface tension in the alveoli. This reduces the tendency for the alveoli to collapse during exhalation and helps maintain the elasticity of the lungs for efficient gas exchange.