PBS
How Blood Evolved (Many Times)
Blood is one of the most revolutionary features in our evolutionary history. Over hundreds of millions of years, the way in which blood does its job has changed over and over again. As a result, we animals have our familiar red blood....
Institute of Human Anatomy
Can YOU Build a Human With TWO Hearts??
In this video, Justin from the Institute of Human Anatomy discusses what would need to happen in order for a human to have two working hearts.
Curated OER
The Circulatory System
Compare a variety of animals' circulatory systems to the human circulatory system. Paul Andersen uses his SMART Board to show the differences between two, three, and four chamber hearts, focusing on the human heart.
Crash Course
Crash Course Biology #27: Circulatory & Respiratory Systems
Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function. [11:40]