4:59 814 d2l.laurentian.ca Quiz 3 0:11:50 elapsed Question 17 (1 point) \( \checkmark \) Saved The exchange of \( \mathrm{CO}_{2} \) and \( \mathrm{O}_{2} \) between the blood and the alveoli is called a) expiration b) inspiration c) external respiration d) none of the other answers e) internal respiration

The correct answer is c) external respiration. This process occurs in the lungs where oxygen from the alveoli diffuses into the blood, while carbon dioxide moves from the blood into the alveoli to be expelled. It’s a crucial part of our respiratory system, ensuring that our cells receive the oxygen they need to function and eliminating waste gases effectively. You might find it interesting that the concept of external respiration has been known since ancient times, with Hippocrates and Galen providing early theories about how the respiratory system works. Their ideas laid the groundwork for our understanding of how gases exchange in the body, paving the way for modern physiology and medicine!