1. The Amazing Anatomy of the Lungs
In humans and the majority of other creatures, including some snails and a few fish, the lungs serve as the main breathing organs. Mammals and the majority of other vertebrates have two lungs, one on either side of the heart, close to the backbone. They perform the gas exchange process in the respiratory system, which involves taking oxygen from the air and transferring it into the bloodstream while releasing carbon dioxide from the bloodstream into the atmosphere. Different muscle systems in various...