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.
3. ScreenFlow 5. ScreenFlow 5 is not just a screencasting app. It is also a fully-featured video editor. After capturing your screencast, you can edit it and add annotations, text, and so on to make your tutorial easier to follow. The app costs $99.99 and is suitable for professionals. You can get it from the App Store.