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

The secretion of cholecystokinin (CCK) in the duodenum is stimulated by the presence of which components in the chyme?

Vitamins and minerals

Nucleic acids and fiber

Fats and proteins

Carbohydrates and water

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Verified step by step guidance

Understand the role of cholecystokinin (CCK): CCK is a hormone secreted by the cells in the duodenum in response to certain components in the chyme. Its primary function is to stimulate the release of digestive enzymes from the pancreas and bile from the gallbladder to aid in digestion.

Identify the components in chyme that stimulate CCK secretion: CCK secretion is specifically triggered by the presence of fats and proteins in the chyme. These macronutrients require specialized enzymes and bile for digestion, which CCK helps facilitate.

Eliminate incorrect options: Vitamins and minerals, nucleic acids and fiber, carbohydrates and water do not directly stimulate CCK secretion. While they are important for overall digestion and absorption, they do not require the same enzymatic and bile-driven processes as fats and proteins.

Relate the physiological response: When fats and proteins are detected in the chyme, the duodenal cells release CCK to ensure proper digestion by signaling the pancreas to release lipase and proteases, and the gallbladder to release bile for emulsification of fats.

Summarize the correct answer: The secretion of cholecystokinin (CCK) in the duodenum is stimulated by the presence of fats and proteins in the chyme, as these components require additional digestive support.