Crash Course Video

Crash Course Video Link: https://www.youtube.com/watch?feature=player_embedded&v=9fxm85Fy4sQ

The respiratory system takes the oxygen needed for the body from the out side of the body and brings it into the lungs where it is diffused through the lungs and into the blood stream. The circulatory system carries the oxygenated blood throughout the body where oxygen is exchanged for waste materials, for example, carbon dioxide, which is carried back to the lungs where it is let into the atmosphere (exhalation) in exchange for Oxygen (inhalation). One of the interesting things I've learned from watching the "Crash Course Video" was how animals obtain oxygen by the process called simple diffusion. This process allows animals to inhale oxygen without lungs, the oxygen goes into the animals, passes through wet membranes, and is then processed. Another interesting fact I learned is mammals and birds are warm blooded, they lose calories because their body needs to regulate it's body temperature which requires even more oxygen.