Gastrointestinal System

    Gastrointestinal System
    Which statement about the layers of the alimentary canal is correct?
    The mucosa (not serosa) absorbs the products of digestion; the muscularis externa causes segmentation and peristalsis; the submucosa (not muscularis) is a dense connective tissue.
    Author: rikazzz Comment
    Gastrointestinal System
    One of the following processes is NOT part of mechanical digestion. Which one?
    Hydrolysis is a chemical process that coverts large food molecules into smaller ones (i.e. performs digestion)
    Author: rikazzz Comment
    Gastrointestinal System
    Which sections of the gut perform the majority of the digestion of food and absorption of the digested products?
    While a small amount of digestion and absorption occurs in the stomach, most occurs in the duodenum (which receives pancreatic enzymes and bile) and the jejunum (which is adapted for absorption).
    Author: rikazzz Comment
    Gastrointestinal System
    The alimentary canal has four layers. Which list below has them in correct order starting from the lumen?
    The mucosal layer is in contact with the canal contents. The serosa is continuous with the visceral peritoneum.
    Author: rikazzz Comment
    Gastrointestinal System
    What is the purpose of the mucosal barrier between the cells of the stomach wall and the stomach contents?
    The stomach contents include the enzyme pepsin and hydrochloric acid, both of which would damage the epithelial cells of the stomach if in contact with them.
    Author: rikazzz Comment
    Gastrointestinal System
    What role do the Kupffer cells of the liver perform?
    Kupffer cells engulf any bacteria that have travelled from the gut in the blood.
    Author: rikazzz Comment
    Gastrointestinal System
    Which part of the gastrointestinal tract contains three distinct layers of smooth muscle in its walls?
    The stomach uses its muscular wall to churn (mix) the contents as part of mechanical digestion.
    Author: rikazzz Comment
    Gastrointestinal System
    The surface area available for absorption in the small intestine is increased by all of the following structures EXCEPT one. Which one?
    Haustra are pouches (or sacculations) in the large intestine that do NOT occur in the small intestine.
    Author: rikazzz Comment
    Gastrointestinal System
    Which one of the listed molecule types is absorbed from the gut?
    All the other molecules are too large to be absorbed through the gut wall.
    Author: rikazzz Comment
    Gastrointestinal System
    Which of the following presents the structures through which chyme travels in the correct sequence?
    Food is not referred to as “chyme” until after it is in the stomach (excludes A). Rectum is the last structure (excludes C). Stomach should be before ileo-caecal valve (excludes D).
    Author: rikazzz Comment