PhysiologyLesson 1 of 7 in the course The Digestive System

Digestive System: Organization, Wall Structure, and Functional Coordination

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

The digestive system transforms food into nutrients the body can use. Its work also depends on close cooperation with other organ systems.

The digestive system breaks down food, releases nutrients from it, and absorbs those nutrients into the body. Digestion includes physical and chemical changes that make food molecules accessible for absorption. The small intestine is the system’s workhorse: most digestion occurs there, and most released nutrients enter the blood or lymph there. Every digestive organ nevertheless contributes to the process.

All flashcards

What is the overall function of the digestive system?
It breaks down food, releases nutrients, and absorbs them into the body so they can support body functions.
Why is the small intestine called the workhorse of digestion?
Most digestion occurs there, and most released nutrients are absorbed into the blood or lymph there.
What is absorption in the context of digestion?
Absorption is the movement of nutrients across the alimentary canal lining into the body's internal environment.
What is the hepatic portal system's role?
It carries nutrient-rich venous blood from the intestines to the liver for processing or storage before the blood returns to the heart.
How does the lymphatic system contribute to digestion?
Lymphatic tissues help defend against pathogens, while lacteals absorb lipids and lymphatic vessels transport them toward the bloodstream.

Quiz questions

  1. Which sequence best describes the alimentary canal from beginning to end?Answer: Mouth, pharynx, esophagus, stomach, small intestine, and large intestine.
  2. How do accessory digestive organs assist the alimentary canal?Answer: They mechanically process food or deliver digestive secretions into the canal.
  3. Which enteric plexus lies in the muscularis and chiefly regulates gut motility?Answer: The myenteric plexus.
  4. What is the general effect of parasympathetic activity on digestive function?Answer: It stimulates enteric neurons and increases secretion and motility.
  5. What does the watery fluid in the peritoneal cavity do?Answer: It lubricates peritoneal surfaces and reduces friction.

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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