It's the circulatory system that provides every cell in our body with the juice they need to function. The human body can only survive about three minutes without oxygen, and it's this incredibly vast network that is responsible for delivering this life-giving gas to all 40 trillion cells in the body.
Paste this code where you want the video to appear.
TV Schedule Filters
Location Help
KET provides PBS national programming for all viewers in our broadcast areas. We use your web browser to confirm your location.
If you're a KET donor, you may watch this content from anywhere in the United States.
We provide online video of PBS national programming for KET viewers. Please allow KET to access your web browser's location to watch this video.
Explore KET
Ad Blocker Detected
It appears your browser is using an ad blocker. In addition to blocking ads, this software affects our ability to properly detect your location, which we must do before allowing access to video content. Please add KET.org to your safe list or disable your ad blocker for the best experience.