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.
Yeast, baking powder, and a combination of baking soda â¦ and vinegar or lemon juice, are the typical leavening agents used in baking. Leavened bread is bread that incorporates any, some, or all of the above agents.It's your typical loaf of bread, or roll.east, baking powder, and a combination of baking soda â¦ and vinegar or lemon juice, are the typical leavening agents used in baking. Leavened bread is bread that incorporates any, some, or all of the above agents.