BLG 143 Study Guide - Aorta, Medulla Oblongata, Exhalation
Document Summary
The main function of the respiratory system is gas exchange. This refers to the process of oxygen and carbon dioxide moving between the lungs and blood. The respiratory system brings oxygen into the blood so the blood can distribute to all of the body"s cells. It also turns oxygen into nutrients and removes carbon dioxide from the body. Amphibians, frogs, and fish all use their skin as a respiratory surface to obtain oxygen and eliminate carbon dioxide. They can only exchange about 1% of their carbon dioxide through there skin. The same goes for terrestrial animals; they are only able to exchange a very small amount of gases through their skin. As a result, they must develop more efficient lungs in order for their bodies to obtain an efficient amount of oxygen for bodily functions. Thus, their respiratory systems are inside their bodies. Also, respiration must take place in a moist environment.
