Lab Name: Answers

1. #33 Junction of Esophagus and Stomach, Human.
    How can you diagnose whether you are looking at the upper or lower portion of the esophagus? By the presence and/or proportion of skeletal muscle.

2. #35 Stomach and Duodenum, Human or Monkey
   To what ultrastructural feature does the striated border correspond?  Microvillus border.

3. #102 (Bodian/silver) Small Intestine. Guinea Pig
   What are the secretory products of these cells?  Hormones (amine or peptide products).  What is their possible function?  Paracrine or endocrine depending on the type of cell and its product.  In what other regions of the digestive tract are they found?  Within the mucosa of the entire GI tract.

4. #101a (PAS) Small Intestine.  Guinea Pig
   In the lamina propria there are macrophages with irregular-sized PAS-positive inclusions.  There are also mast cells.  What accounts for the intense PAS-positivity of these cells? Carbohydrate groups

<<Back