Question

how are alveoli designed to maximize the diffuision of the respiratory gases ? answer acc. to 4 marks

Answer 1

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.

Alveoli are small pouches or sac-like structures surrounded by blood capillaries.
The presence of millions of alveoli help in providing a very large surface area for the exchange of gases.
There are around 750 million alveoli in our lungs with a surface area of about 80m².
When we breathe in,the alveoli expand and maximise the exchange of gases.

Thank you!
Hope my answer helps you!
PLEASE MARK ME AS BRAINLIEST
Regards,
Adira.

Answer 2

Answer:

The walls of the alveoli is folded and has large surface areas. It contain an extensive network of blood vessels which provide a surface where the exchange of gases can take place.