How is the removal of Carbon dioxide from the lungs?

Answer 1

== == Through the process of gaseous exchange; air is warmed,moistened and cleaned as it is drawn into the nasel passage by mucus in the trachea. This moistened air then enters alveoli where gaseous exchange occurs. Around each alveoli there is a series of capillaries, O2 dissolves in to a moisture lining in the alveolus and then in to the red blood cells while CO2 diffuses out of the plasma and red blood cells which is then removed from the body by expiration.

The answer above is correct; however, in specific the blood sent to the lungs is CO2 rich, while the air in the alveoli is oxygen rich. This setup creates what is called a "diffusion gradient"-- things will try to travel from a location of high density to low density. This gradient causes CO2 to travel out of the blood and into the air while oxygen is transferred into the bloodstream.

Answer 2

Carbon dioxide will spontaneously pass from the blood stream via the lung into the air, because tha CO2 concentration is lower in air than in the blood. When new air is continously breathed in, most of the old CO2 will be removed from the lungs and more can be released from the blood.

This is not completely unlike when a can of soda will eventually lose its fizzyness after being opened.

However, the body has a few tricks to improve the process, i.e. make it faster.

CO2 (carbon dioxide) is present in the blood stream mostly as dissolved bicarbonate ions (HCO3-). The capillary blood vessels in the lungs are very thin and therefore has a large surface area, furhtermore the lungs themselves has very large surface area due to being folded into alveoli. This increases the contact between the air and the blood and thus increases the passage of carbon dioxide.

Also in the lungs' walls an enzyme is present that speeds up the conversion from bicarbonate to carbondioxide.

Answer 3

oxygen is pumped throught it to remove it.

Answer 4

Carbon dioxide in the lungs is exhaled.