18 Questions
What is the term used to describe the increase of HCO3− in blood leaving the stomach?
Alkaline tide
Which phase of gastric secretion involves the stimulation of parietal cells to release HCl?
Gastric phase
What is the purpose of H+/K+ ATPase in the mechanism of HCl formation?
To pump H+ into the stomach lumen
What is the term used to describe the rhythmic contractions of the stomach muscles?
Peristaltic waves
Which of the following is NOT a hormone involved in regulating gastric secretion?
Insulin
What is the term used to describe the factors that slow down the emptying of the stomach?
Neural and hormonal factors
Which nerve is primarily involved in the pharyngeal-esophageal phase of deglutition?
Vagus nerve
What is the primary function of the stomach?
Temporary storage and chemical breakdown of protein digestion
What type of epithelium is present in the mucosa layer of the stomach?
Simple columnar epithelium
What is the function of parietal cells in the stomach?
Production of HCl and intrinsic factor
What is the volume of the empty stomach?
50 ml
What is the term for the folds in the stomach mucosa when empty?
Rugae
What is the role of the vagus nerve in regulating gastric secretion?
Increases gastric juice secretion
Which hormone stimulates HCl secretion by the stomach?
Gastrin
What is the pH range of the stomach acid produced by parietal cells?
pH 1.5-3.5
What is the main function of pepsinogen?
To denature proteins
What is the primary cause of most peptic ulcers?
Helicobacter pylori infection
What is the approximate volume of gastric juice secreted by the stomach per day?
3 L
Test your knowledge on the regulation of gastric secretion and the three phases involved: Cephalic phase, Gastric phase, and Intestinal phase. Explore the hormones and paracrines that play a role in digestion, as presented in Table 23.1-1.
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