Carbon dioxide diffuses out of the tissues and into the blood, where it is dissolved in the plasma. While some of the carbon dioxide remains dissolved in the plasma, most carbon dioxide diffuses into our red blood cells.
A screencast is a digital movie in which the setting is partly or wholly a computer screen, and in which audio narration describes the on-screen action. It's not a new idea.
Screencast-O-Matic is a handy utility, and its free version only has a few limitations. The straightforward mechanics make it a snap to use for even the least computer-savvy, and direct publishing options give you a great way to share anything you need with friends and colleagues.