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The Diffusion is the exchange of oxygen (O2) and carbon dioxide (CO2) between the alveoli and the blood. So blood that is pumping through the capillaries in the lungs has a low concentration of O2 and a high concentration of CO2, in the alveoli it is high concentration O2 low concentration CO2. Therefore the 2 gases exchange across the alveoli membrane by diffusion trying to establish a concentration gradient.
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How do gases get into and out of the blood?
Via Diffusion across the EPITHELIAL CELL LININGS of the Alveoli.
Why do alveoli lack cilia and mucous?
The function of alveoli is to exchange gases: oxygen is taken into the blood and carbon dioxide leaves the blood by diffusion across the alvoelar wall. If the alveoli were covered with mucus this would reduce the diffusion of gas molecules between the air and the blood. As there is no mucus, there is no need for cilia either, which Cary out the function of moving cilia out of the respiratory system.
When gases are exchanged between the alveoli and blood what body systems are involved?
The respiratory and circulatory systems are involved in the exchange of gases between the alveoli and blood. The alveoli are part of the lungs, and their surrounding capillaries are part of the circulatory system.
Why are the alveoli sometimes called respiratory membrane?
The alveoli are sometimes refer to as the respiratory membrane. This due to the transfer of gases that occurs between the epithelium (the membrane) and the capillaries (the blood). When Oxygen and carbon dioxide transfer across this membrane through diffusion Oxygen goes into the blood and Carbon dioxide is diffused out into the Alveoli.
What process is responsible for the exchange of gases in the alveoli and the blood?
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.
Where is the site where Gases are exchanged?
Alveoli are site of gas exchange. Actual diffusion of gases occurs at interstitial space between capillaries and alveolar cells.
Why do the walls of the capillaries and aveoli need to be thin?
The walls of alveoli are thin to allow the exchange of gases (Co2 and O2) between blood capillaries and the aveoli in the lungs.
Tiny air sacs where the exchange of gases between air and blood takes place?
alveoli
What factors are important for gas exchange?
1. The blood vessels are completely surrounding the alveoli for easy diffusion into the blood vessels 2. The alveoli and the blood vessels are made up of a very thin layer of cells. a single layer of simple squamos epithelium. For easy diffusion 3. There is a moist layer layering the alveoli which the gases dissolve into. This aids diffusion. 4. The blood vessels are very thin, this ensures that the red blood cells enter them in a single file row. This enables maximum diffusion. 5. The shape of the red blood cells is flat, this is increases surface area for maximum absorption. 6. The alveoli itself are round, balloon shape. This also increases surface area for maximum absorption.
What are the tiny air sacs called where the exchange of gases between air and blood take place?
Alveoli.
What direction do oxygen particles go in an alveoli?
they travel through the capillary which exchanges them to carbon dioxide
What division of the respiratory system exchanges gases with the blood?
The alveoli.
