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Stack #4579702

Anatomy weeks 6-12.

QuestionAnswer
What are the three components of the mucosa layer ? Mucous epithelium, lamina propria, and muscularis mucosae
What are the small projections on the circular folds of the small intestine called, and why are they important? They are called villi, and they increase surface area for absorption
Where does a meal begin its journey through the alimentary canal, and what occurs there? In the mouth, where chewing mechanically breaks down food and saliva starts chemical digestion.
Which digestive enzymes are secreted by the pancreas, and what do they digest? Pancreatic amylase (carbohydrates), lipase (fats), proteases like trypsin/chymotrypsin (proteins), and nucleases (nucleic acids).
Name the three divisions of the small intestine in order from the stomach. Duodenum, jejunum, ileum.
What is the approximate diameter and length of the small intestine? bout 2.5 cm (1 inch) in diameter and 6 to 8 meters (20 to 26 feet) in length
What are the four main layers of the gastrointestinal (GI) tract wall, and which layer is in direct contact with the lumen? The four layers are mucosa, submucosa, muscular layer, and fibroserous (serosa) layer. The mucosa is the innermost layer that faces the lumen.
What is the function of the mesentery in the GI tract? The mesentery connects the GI tract to the abdominal wall and allows blood vessels and nerves to reach digestive organs.
Why is the muscularis mucosae important in the mucosa layer? It helps move the mucosa, facilitating absorption and secretion.
What structures are found in the submucosa layer of the GI tract, and what is the function of the submucosal plexus (Meissner plexus)? The submucosa contains connective tissue, small glands, blood vessels, and parasympathetic nerves. The submucosal plexus helps regulate secretions and local blood flow.
What is the function of bile, and which organ produces it? Bile emulsifies fats for digestion; it is produced by the liver and stored in the gallbladder.
Created by: user-1990619
 

 



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