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.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.