Medical Histology Lecture: Digestive System Structure and Function
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Questions and Answers

What is the function of the GI tract?

  • To chew and break down food into small pieces
  • To absorb small molecules and water into the blood (correct)
  • To release digestive enzymes for chemical digestion
  • To secrete hormones for growth

Which of the following is NOT part of the digestive tract?

  • Liver (correct)
  • Small intestine
  • Stomach
  • Esophagus

What is the main purpose of ingestion in the digestive process?

  • To secrete saliva
  • To move food through the digestive tract
  • To introduce food into the oral cavity (correct)
  • To mix food with digestive enzymes

What is the primary component of enamel in the human body?

<p>Calcium hydroxyapatite (B)</p> Signup and view all the answers

Which process involves breaking down food into digestible pieces?

<p>Mastication (C)</p> Signup and view all the answers

Why is fluoride added to toothpaste and water supplies?

<p>To make enamel more resistant to acidic dissolution (A)</p> Signup and view all the answers

What is the role of hormone release in the digestive system?

<p>Control motility and secretion locally (C)</p> Signup and view all the answers

Where are esophageal cardiac glands found?

<p>In the lamina propria near the stomach (D)</p> Signup and view all the answers

Which term refers to enzymatic breakdown of large food molecules into smaller subunits?

<p>Chemical digestion (B)</p> Signup and view all the answers

Which type of muscle is predominant in the lower portion of the esophagus?

<p>Smooth muscle (D)</p> Signup and view all the answers

What is the function of esophageal glands?

<p>Secretion of mucus to facilitate food transport and protect the mucosa (D)</p> Signup and view all the answers

What is the mucosal lining of the esophagus primarily composed of?

<p>Non-keratinized stratified squamous epithelium (C)</p> Signup and view all the answers

What type of epithelium covers the red vermilion zone of each lip?

<p>Keratinized stratified squamous epithelium (B)</p> Signup and view all the answers

Which structure manipulates ingested materials during mastication and swallowing?

<p>Tongue (D)</p> Signup and view all the answers

What is the primary function of filiform papillae on the tongue?

<p>Facilitate the movement of food during chewing (C)</p> Signup and view all the answers

Which type of lingual papillae are interspersed among filiform papillae and are mushroom-shaped?

<p>Fungiform papillae (C)</p> Signup and view all the answers

Where are the foliate papillae located on the tongue?

<p>Anterior to the sulcus terminalis (B)</p> Signup and view all the answers

Which part of the tongue has hundreds of small protruding papillae and mass lingual tonsils?

<p>Dorsal Surface (B)</p> Signup and view all the answers

What is the role of Paneth cells in the intestine?

<p>Participate in innate immunity by releasing defensins (A)</p> Signup and view all the answers

Where are chylomicrons produced in the intestinal cells?

<p>Golgi apparatus (C)</p> Signup and view all the answers

Which cells in the intestine have chemoreceptors to sample nutrient levels?

<p>Enteroendocrine cells (C)</p> Signup and view all the answers

What is the function of M cells in the intestine?

<p>Sample intestinal microorganisms (B)</p> Signup and view all the answers

Which structure is responsible for uptake of chylomicrons by lacteal?

<p>Villi (D)</p> Signup and view all the answers

What is the primary function of lipids in enterocytes?

<p>To form chylomicrons for lipid transport (B)</p> Signup and view all the answers

What is the main function of the appendix?

<p>Being a component of the MALT (D)</p> Signup and view all the answers

What differentiates the muscularis of the colon from that of the small intestine?

<p>Outer layer fibers gathered into tinea coli in the colon (A)</p> Signup and view all the answers

What type of lining replaces the simple columnar lining at the recto-anal junction?

<p>Stratified squamous epithelium (A)</p> Signup and view all the answers

What structures form folds called anal columns in the anal canal?

<p>Submucosa and lamina propria (A)</p> Signup and view all the answers

What muscle forms the internal anal sphincter near the anus?

<p>Circular layer of the muscularis of rectum (A)</p> Signup and view all the answers

What does defecation involve in terms of muscle action?

<p>Action of voluntary muscle (C)</p> Signup and view all the answers

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