Protein digestion takes place between your mouth and your small intestine. All the cells of your body contain protein, and this protein is continually broken down and remodeled to meet your growth and maintenance needs.
If you need help, here is a hintâ¦ Each year, there are over 100,000 heart valve surgeries performed in the United States. For the answer, scroll down below the picture of a diseased mitral valve with calcified valve flaps.
Background. A heart valve acts as a check valve, opening and closing to control blood flow. This cycle occurs about 40 million times per year or two billion in an average lifetime. Natural valves can develop several problems, either the valve opening becomes narrow or may not close completely.