Gastrointestinal System

    Gastrointestinal System
    What does bile do?
    Emulsification of fat is the role played by bile.
    Author: rikazzz Comment
    Gastrointestinal System
    What happens to the products of lipid digestion in the gut?
    Fats, being lipid soluble, diffuse into epithelial cells to be reconstituted into triglycerides.
    Author: rikazzz Comment
    Gastrointestinal System
    Why are the contents of the stomach and intestines considered to be potentially dangerous to health?
    The stomach contains hydrochloric acid; the duodenum contains enzymes that will hydrolyse proteins, fats and carbohydrates; and the large intestine contains bacteria (normal flora).
    Author: rikazzz Comment
    Gastrointestinal System
    What is the function of the oesophagus in digestion?
    It is merely a conduit to transfer food from the mouth to the stomach while bypassing the thoracic structures.
    Author: rikazzz Comment
    Gastrointestinal System
    Which liver cells produce bile?
    Hepatocytes are liver cells. Kupffer cells are macrophages, while sinusoids are blood capillaries.
    Author: rikazzz Comment
    Gastrointestinal System
    Which one of the following is NOT secreted in pancreatic juice?
    Pepsinogen is secreted by the chief cells (zymogenic cells) in the gastric pits of the stomach.
    Author: rikazzz Comment
    Gastrointestinal System
    Which of the following is one of the processes of mechanical digestion?
    In the stomach, peristaltic waves (~3 per minute) mix the contents with gastric juice which facilitates chemical digestion. Secretion, while being mechanical, is not digestion.
    Author: rikazzz Comment
    Gastrointestinal System
    What is the role of gastrin in the digestive system?
    Gastrin is a hormone that stimulates gastric secretion (from the stomach wall).
    Author: rikazzz Comment
    Gastrointestinal System
    Choose the list which has the selected structures of the alimentary canal in the same order that chyme would pass through them.
    Descending colon is after the transverse colon; small intestine is before the large intestine.
    Author: rikazzz Comment
    Gastrointestinal System
    “Emulsification” is used to describe which of the following processes?
    Emulsification surrounds small droplets of fat with a coating that prevents the droplets from amalgamating into larger droplets. This provides more surface area for lipases to work on than would be the case if only larger droplets existed.
    Author: rikazzz Comment