Supriya SME Edumarz
Solution: Alveoli are thin walled sacs roughly 0.2 to 0.5mm in diameter , containing a network of blood capillaries that appears like a bunch of grapes to facilitate the exchange of gases between the air filled alveoli and the blood.these are also known as pulmonary alveoli
Explanation:
Alveoli are the part of the lungs,with the millions of tiny balloon -like structures with thin elastic walls.the whole surface of alveoli functions like a respiratory system
Alveoli are the end point of the respiratory system and the primary sites of gas exchange between blood and lungs. ( oxygen and carbon dioxide) by the simple method of diffusion . The walls of the alveoli are extremely thin ( this lets oxygen and carbon dioxide get passed between alveoli and capillaries) and surrounded by capillaries and the fact that there are large number of alveoli in lungs means there is availability of large surface area for the respiration of gasses. As a result, alveoli are intended to enhance gas exchange.