1. Gastroesophageal Junction Note the transition in the epithelium between the esophagus and the stomach. Describe the epithelial change. What is the functional importance of this transition in epithelium between the two organs?
Gastroesophageal junction.
Label: stratified squamous epithelium, simple columnar epithelium, gastroesophageal junction. Total magnification:
2. Stomach Locate the four tissue layers (mucosa, submucosa, muscularis externa, serosa). Note the gastric pits and gastric glands.
What substances are secreted from the gastric glands? What are the functions of these secretions?
Stomach Wall
Label: four tissue layers (mucosa, submucosa,
muscularis externa, serosa)
Total magnification: ______