119. Pulmonary gas exchange occurs in the
networks of thin-walled
This exchange takes place using the process of
of the lungs. These are grape-like clusters surrounded by
(2 words)

These are grape-like clusters surrounded by blood capillaries

Explanation:

The alveoli (grape-like structures) are surrounded by a network of blood capillaries. They supply blood for decarbonization and oxygenation. The large network provides a large surface area for this gaseous exchange. In addition, the alveoli are moist to help increase the rate of diffusion of the gases in and out of the blood capillaries.