Learning Objectives

• Describe the composition and functions of saliva
• Explain how salivation is regulated
• Name the cell types responsible for secreting the components of gastric juice
• Explain how gastric acid is produced
• Explain the different phases of gastric secretion
• Describe the role of digestive secretions produced by the pancreas
• Describe the recycling and storage of bile, and the roles of bile salts
• List the sites of production, the target organs, and responses of the gastro intestinal hormones
• Describe the pathophysiology of peptic ulcer disease

Salivary Secretions

• structurally, what type of gland are salivary glands?
• secretory products of serous vs mucus cells?
• what are the 3 major salivary glands? products? % of saliva produced?
• why is saliva secretion a two-step process?
• how is final saliva different to initial saliva?
• what effect does salivary flow rate have on saliva composition?
• what is the mechanism of saliva ejection?
• how does aldosterone affect saliva composition?