aqua05
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EXPLAIN HOW THE STRUCTURE OF THE MAMMALIAN LUNG IS ADAPTED FOR RAPID GASEOUS EXCHANGE 6 marks

The mammalian lung has small and millions of alveoli which increases the surface area in which diffusion takes place. The membrane around the alveoli is thin and is made up of squamous epithelium which is flat, which further increases the surface area and reduces the diffusion distance. Larger the surface area, the faster the the gaseous molecules come into contact with the surface, thus increasing the rate of diffusion of gases.
The lungs are very well ventilated. there is high concentration of oxygen in the alveoli and high concentration of CO2 in the blood vessel from the heart, thus CO2 diffuses out if the blood into the lungs via the moist lining and O2 diffuses from the alveoli into the blood vessels. The moist lining makes gaseous exchange possible as gas exchange would dissolve into the moisture thus the gases diffuses faster.
The alveoli is surrounded by a vast network of capillaries which is one cell thick, which reduces the diffusion distance and also makes the gases diffuse much more faster and efficient. The network of capillaries also maintains a steep concentration gradient thus increasing the rate of diffusion.

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MANY THANKS
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Mocking_bird
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(Original post by aqua05)
Can anyone rate for me this question

EXPLAIN HOW THE STRUCTURE OF THE MAMMALIAN LUNG IS ADAPTED FOR RAPID GASEOUS EXCHANGE 6 marks

The mammalian lung has small and millions of alveoli which increases the surface area in which diffusion takes place. The membrane around the alveoli is thin and is made up of squamous epithelium which is flat, which further increases the surface area and reduces the diffusion distance. Larger the surface area, the faster the the gaseous molecules come into contact with the surface, thus increasing the rate of diffusion of gases.
The lungs are very well ventilated. there is high concentration of oxygen in the alveoli and high concentration of CO2 in the blood vessel from the heart, thus CO2 diffuses out if the blood into the lungs via the moist lining and O2 diffuses from the alveoli into the blood vessels. The moist lining makes gaseous exchange possible as gas exchange would dissolve into the moisture thus the gases diffuses faster.
The alveoli is surrounded by a vast network of capillaries which is one cell thick, which reduces the diffusion distance and also makes the gases diffuse much more faster and efficient. The network of capillaries also maintains a steep concentration gradient thus increasing the rate of diffusion.

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MANY THANKS
I'm pretty sure you already know this is 6 marks :facepalm:
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aqua05
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(Original post by Mocking_bird)
I'm pretty sure you already know this is 6 marks :facepalm:
just want to make sure i have written it properly & i get those 6 marks
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tobeobi
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(Original post by aqua05)
Can anyone rate for me this question

EXPLAIN HOW THE STRUCTURE OF THE MAMMALIAN LUNG IS ADAPTED FOR RAPID GASEOUS EXCHANGE 6 marks

The mammalian lung has small and millions of alveoli which increases the surface area in which diffusion takes place. The membrane around the alveoli is thin and is made up of squamous epithelium which is flat, which further increases the surface area and reduces the diffusion distance. Larger the surface area, the faster the the gaseous molecules come into contact with the surface, thus increasing the rate of diffusion of gases.
The lungs are very well ventilated. there is high concentration of oxygen in the alveoli and high concentration of CO2 in the blood vessel from the heart, thus CO2 diffuses out if the blood into the lungs via the moist lining and O2 diffuses from the alveoli into the blood vessels. The moist lining makes gaseous exchange possible as gas exchange would dissolve into the moisture thus the gases diffuses faster.
The alveoli is surrounded by a vast network of capillaries which is one cell thick, which reduces the diffusion distance and also makes the gases diffuse much more faster and efficient. The network of capillaries also maintains a steep concentration gradient thus increasing the rate of diffusion.

Feel free to comment
MANY THANKS
Hi, your answer is really good! i was just wondering if you or anyone in this thread knew where in the textbook I can find some info on how the lungs are adapted to gas exchange??
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klynch
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(Original post by aqua05)
Can anyone rate for me this question

EXPLAIN HOW THE STRUCTURE OF THE MAMMALIAN LUNG IS ADAPTED FOR RAPID GASEOUS EXCHANGE 6 marks

The mammalian lung has small and millions of alveoli which increases the surface area in which diffusion takes place. The membrane around the alveoli is thin and is made up of squamous epithelium which is flat, which further increases the surface area and reduces the diffusion distance. Larger the surface area, the faster the the gaseous molecules come into contact with the surface, thus increasing the rate of diffusion of gases.
The lungs are very well ventilated. there is high concentration of oxygen in the alveoli and high concentration of CO2 in the blood vessel from the heart, thus CO2 diffuses out if the blood into the lungs via the moist lining and O2 diffuses from the alveoli into the blood vessels. The moist lining makes gaseous exchange possible as gas exchange would dissolve into the moisture thus the gases diffuses faster.
The alveoli is surrounded by a vast network of capillaries which is one cell thick, which reduces the diffusion distance and also makes the gases diffuse much more faster and efficient. The network of capillaries also maintains a steep concentration gradient thus increasing the rate of diffusion.

Feel free to comment
MANY THANKS
very useful thank you
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honeybeesavo
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great answer, very informative.
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LT13
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Looks great but I'm not sure if it's important being specific about the fact the alveoli increase the surface to volume ratio, highlighting the fact that the large surface area they have is very large in terms of the actual volume of space they occupy. Other than that looks pretty solid. Another thing would be that there would be more surfaces for the oxygen/CO2 to diffuse through and therefore diffusion is faster, it's semi-implied but might be important and just help your understanding.
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casdfsadf
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One thing that has confused me for a while is the moist linning of the alveoli. The AQA AS biology book by Pauline Lowrie ... states on P117 that the thin film of water in fact slows the rate of diffusion (as it increases the distance and is also a medium which slows the rate of diffusion camparably to air). This consequently contradicts what is said previously, where it aids the process.For those who don't have the book the reasoning goes that a moist lining is an unavoidable feature as a membrane permeable to oxygen is also permeable to water.Both of these sound feasible but entirely contradictory.
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Ruhab Dabeer
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Very nerdy answer
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Ruhab Dabeer
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(Original post by aqua05)
Can anyone rate for me this question

EXPLAIN HOW THE STRUCTURE OF THE MAMMALIAN LUNG IS ADAPTED FOR RAPID GASEOUS EXCHANGE 6 marks

The mammalian lung has small and millions of alveoli which increases the surface area in which diffusion takes place. The membrane around the alveoli is thin and is made up of squamous epithelium which is flat, which further increases the surface area and reduces the diffusion distance. Larger the surface area, the faster the the gaseous molecules come into contact with the surface, thus increasing the rate of diffusion of gases.
The lungs are very well ventilated. there is high concentration of oxygen in the alveoli and high concentration of CO2 in the blood vessel from the heart, thus CO2 diffuses out if the blood into the lungs via the moist lining and O2 diffuses from the alveoli into the blood vessels. The moist lining makes gaseous exchange possible as gas exchange would dissolve into the moisture thus the gases diffuses faster.
The alveoli is surrounded by a vast network of capillaries which is one cell thick, which reduces the diffusion distance and also makes the gases diffuse much more faster and efficient. The network of capillaries also maintains a steep concentration gradient thus increasing the rate of diffusion.

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MANY THANKS
Very nerdy
D:/
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Eashy
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(Original post by aqua05)
Can anyone rate for me this question

EXPLAIN HOW THE STRUCTURE OF THE MAMMALIAN LUNG IS ADAPTED FOR RAPID GASEOUS EXCHANGE 6 marks

The mammalian lung has small and millions of alveoli which increases the surface area in which diffusion takes place. The membrane around the alveoli is thin and is made up of squamous epithelium which is flat, which further increases the surface area and reduces the diffusion distance. Larger the surface area, the faster the the gaseous molecules come into contact with the surface, thus increasing the rate of diffusion of gases.
The lungs are very well ventilated. there is high concentration of oxygen in the alveoli and high concentration of CO2 in the blood vessel from the heart, thus CO2 diffuses out if the blood into the lungs via the moist lining and O2 diffuses from the alveoli into the blood vessels. The moist lining makes gaseous exchange possible as gas exchange would dissolve into the moisture thus the gases diffuses faster.
The alveoli is surrounded by a vast network of capillaries which is one cell thick, which reduces the diffusion distance and also makes the gases diffuse much more faster and efficient. The network of capillaries also maintains a steep concentration gradient thus increasing the rate of diffusion.

Feel free to comment
MANY THANKS
So key points to talk about are:
-High Surface Area
-Rich blood supply
-Moist surface
-Short diffusion distance
This is a very good answer. Thank you for help
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Ruhab Dabeer
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Yeah just don't be nerdy about it
(Original post by Eashy)
So key points to talk about are:
-High Surface Area
-Rich blood supply
-Moist surface
-Short diffusion distance
This is a very good answer. Thank you for help
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