[Solved] The period of declining growth in real GDP between the peak of the business cycle and the trough is called the A) contractionary phase. B) boom. C) expansionary phase. D) stationary phase. Blood Sugar: A measure of the concentration of glucose in the blood. Mucus: A sticky, slimy substance produced by mucous membranes and glands designed to moisturize and protect certain parts of the body, such as the nose and throat. Specimen Testing: The analysis of a sample of body tissue or fluid to diagnose or monitor health conditions. Microscopic Examination: The analysis of small objects or structures that cannot be seen with the naked eye, using a microscope.