What is the function of flour in baking?

Flour gives the muffins or cakes it's volume and structure. The flour browns during the baking process so the finished produce will usually have a golden brown colour. Its also high in starch which is the most important carbohydrate in the human diet.Different types of flours have different jobs. Self-raising flour will make the batter raise when baking. It has a combination of plain flour and various raising agents. These include sodium and calcium phosphates, and sodium carbonate. If you just use all purpose flour than you would need to add 2 teaspoons of "bi-crabinate soda" for ever 250grams.