Learn more: Angina is chest pain or discomfort caused when your heart muscle doesn't get enough oxygen-rich blood. It may feel like pressure or squeezing in your chest. The discomfort also can occur in your shoulders, arms, neck, jaw, or back.Angina pain may even feel like indigestion.But, angina is not a disease.earn more: Angina is chest pain or discomfort caused when your heart muscle doesn't get enough oxygen-rich blood. It may feel like pressure or squeezing in your chest. The discomfort also can occur in your shoulders, arms, neck, jaw, or back. Angina pain may even feel like indigestion.
Definition of leaven. 1a : a substance (such as yeast) used to produce fermentation in dough or a liquid; especially : sourdoughb : a material (such as baking powder) used to produce a gas that lightens dough or batter.
Leaveners are used in baked goods to improve texture and visual appearance. They create air pockets within a dough or batter to give the final product a light, fluffy texture. In general, leaveners can be divided into three categories: physical, biological, or chemical. Carbon dioxide gas is most often responsible for the leavening action in baked goods and can be produced by biological agents like yeast, or chemical agents such as baking soda and baking powder. Air: Air is often incorporated into batters when butter and sugar are creamed together.