The phases that regulate motility and secretion in the stomach. Concept introduction: Stomach is a muscular sac that is expansible and acts as the food and fluid reservoir. It can hold up to 1 to 1.5L of fluid and food. The food from the esophagus is received by the stomach. Gastric acids and digestive enzymes for the digestion of food are secreted in the stomach. The process of secretion requires five different types of secretory cell made up of gastric epithelium. Those cells include surface mucous cells, mucous neck cells, parietal cells, chief cells, and G-cells.

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According to a recent study, 1 out of 50,000 people will be diagnosed with cystic fibrosis. Cystic fibrosis can be caused by a mutant form of the CFTR gene (dominant gene symbol is F and mutant is f). A. Using the rate of incidence above, what is the frequency of carriers of the cystic fibrosis allele for CFTR in the US? (3 pts) B. In a clinical study, 400 people from the population mentioned in (A.) were genotyped for BRCA1 Listed below are the results. Are these results in Hardy- Weinberg equilibrium? Use Chi Square to show whether or not they are. (3 pts) BRCA1 genotype # of women 390 BB Bb bb 10 0 12pt Paragraph L BIUAV V T² v V

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Chapter 26.2, Problem 21LO

Summary Introduction

To describe: The phases that regulate motility and secretion in the stomach.

Concept introduction: Stomach is a muscular sac that is expansible and acts as the food and fluid reservoir. It can hold up to 1 to 1.5L of fluid and food. The food from the esophagus is received by the stomach. Gastric acids and digestive enzymes for the digestion of food are secreted in the stomach. The process of secretion requires five different types of secretory cell made up of gastric epithelium. Those cells include surface mucous cells, mucous neck cells, parietal cells, chief cells, and G-cells.

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