The fluorescent dye employed by hematology analyzers to count reticulocytes binds to:

The regular interruptions of a myelin sheath are called

a. Axon hillocks b. Nodes of Ranvier c. Axon telodendron d. Initial segments

You respond to a call of an ill person. Upon arrival, you find your patient complaining of diffuse abdominal pain and hematemesis. When asked, the patient states that the emesis was "coffee ground" in nature. You suspect:

A) lower GI bleed. B) upper GI bleed. C) melena. D) esophageal varices.