[Solved] Describe how the rocker arms are adjusted on OHV engines with hydraulic lifters. 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.