View full lesson: http://ed.ted.com/lessons/gravity-and-the-human-body-jay-buckey

Our bodies function necessarily under the presence of gravity; how blood pumps, a sense of balance and bone growth are all due to life in a world where gravity is an inescapable reality. Armed with experiments from neuroscientists David Hubel and Torten Wiesel, astronaut Jay Buckey presents a thought experiment: How would our bodies work without the force of gravity?

Lesson by Jay Buckey, animation by TED-Ed.