Key Point The majority of carbon dioxide produced by the active muscles is transported back to the lungs in the form of bicarbonate ions. Carbaminohaemoglobin CO2 transport also can occur when the gas binds with haemoglobin, forming a compound called Carbaminohaemoglobin.
Screenplay format first element: master headings. What is a master scene heading? In screenplay format, a master scene heading, also called primary slug line, is a one line of text in a screenplay that comes before the description of a scene. It gives a context for the whole scene.
The content is usually invented solely by the screenwriter, though spec screenplays can also be based on established works, or real people and events. The spec script is a Hollywood sales tool. The vast majority of scripts written each year are spec scripts, but only a small percentage make it to the screen.