Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

23. The Digestive System

Introduction to the Digestive System

Anatomy & Physiology

23. The Digestive System

Introduction to the Digestive System

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Multiple Choice

Which structure regulates the flow of contents from the stomach to the duodenum?

Cardiac sphincter

Lower esophageal sphincter

Pyloric sphincter

Ileocecal valve

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Verified step by step guidance

Step 1: Understand the anatomy of the stomach and its connection to the duodenum. The stomach is a muscular organ that connects to the duodenum, the first part of the small intestine, via a structure that regulates the flow of partially digested food (chyme).

Step 2: Identify the role of sphincters in the digestive system. Sphincters are circular muscles that act as valves to control the passage of substances between different parts of the digestive tract.

Step 3: Differentiate between the listed structures. The cardiac sphincter (also known as the lower esophageal sphincter) regulates the flow of food from the esophagus into the stomach. The ileocecal valve regulates the flow of contents from the small intestine to the large intestine. The pyloric sphincter specifically controls the flow of chyme from the stomach to the duodenum.

Step 4: Focus on the pyloric sphincter. The pyloric sphincter is located at the distal end of the stomach and acts as a gatekeeper, ensuring that chyme is released into the duodenum in controlled amounts to facilitate digestion and absorption.

Step 5: Confirm the correct answer. Based on the anatomical function, the structure that regulates the flow of contents from the stomach to the duodenum is the pyloric sphincter.