|
(Q.71) How do the alveoli of
lungs in human body help in the exchange of gases?
|
|
|
(Ans) Alveoli provide a surface for the
exchange of gases. An extensive network of blood vessels is present in the wall
of the alveoli. By lifting our ribs and flatten the diaphragm, the chest cavity
becomes spacious. Air
is sucked into the
lungs and alveoli. The oxygen from the breath, diffuses into the blood and CO2
from the blood brought from the body, diffuses out into the air.
No comments:
Post a Comment