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

The Gallbladder

Anatomy & Physiology

23. The Digestive System

The Gallbladder

Previous problemNext problem

Problem 9

Textbook Question

Bile release from the gallbladder into the duodenum occurs only under the stimulation of
(a) Cholecystokinin
(b) Secretin
(c) Gastrin
(d) Enteropeptidase

Verified step by step guidance

Understand the role of bile in digestion: Bile is a substance produced by the liver and stored in the gallbladder. It helps emulsify fats in the small intestine, making them easier to digest.

Identify the hormones involved in digestive processes: Cholecystokinin (CCK), secretin, gastrin, and enteropeptidase are all important in regulating digestion, but they have distinct roles.

Focus on cholecystokinin (CCK): CCK is released by the cells of the duodenum in response to the presence of fatty acids and amino acids in the chyme. It stimulates the gallbladder to contract and release bile into the duodenum.

Clarify the roles of the other options: Secretin primarily stimulates the pancreas to release bicarbonate to neutralize stomach acid. Gastrin stimulates acid production in the stomach. Enteropeptidase activates pancreatic enzymes but does not directly influence bile release.

Conclude that bile release from the gallbladder into the duodenum is specifically stimulated by cholecystokinin (CCK), as it directly triggers gallbladder contraction and bile secretion.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Play a video:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Bile and its Function

Bile is a digestive fluid produced by the liver and stored in the gallbladder. It plays a crucial role in the emulsification of fats, making them easier to digest and absorb in the small intestine. The release of bile into the duodenum is essential for the digestion of dietary lipids.

Cholecystokinin (CCK)

Cholecystokinin is a hormone released by the small intestine in response to the presence of fats and proteins. It stimulates the gallbladder to contract and release bile into the duodenum, as well as promoting the secretion of digestive enzymes from the pancreas. CCK is a key regulator of digestion in the upper gastrointestinal tract.

Hormonal Regulation of Digestion

The digestive process is regulated by various hormones, including secretin, gastrin, and cholecystokinin. Each hormone has specific roles; for instance, secretin stimulates the pancreas to release bicarbonate to neutralize stomach acid, while gastrin promotes gastric acid secretion. Understanding these hormones is essential for grasping how digestion is coordinated in the body.