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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which structure controls the flow of chyme from the stomach to the small intestine?

Cardiac sphincter

Lower esophageal sphincter

Ileocecal valve

Pyloric sphincter

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Verified step by step guidance

Step 1: Understand the function of the stomach and its role in digestion. The stomach is responsible for breaking down food into a semi-liquid substance called chyme, which is then passed to the small intestine for further digestion and nutrient absorption.

Step 2: Learn about the pyloric sphincter. This structure is a ring of smooth muscle located at the junction between the stomach and the duodenum (the first part of the small intestine). Its primary function is to regulate the flow of chyme from the stomach to the small intestine.

Step 3: Differentiate the pyloric sphincter from other structures mentioned in the problem. For example, the cardiac sphincter (also known as the lower esophageal sphincter) controls the flow of food from the esophagus into the stomach, while the ileocecal valve regulates the flow of material from the small intestine to the large intestine.

Step 4: Recognize that the pyloric sphincter opens and closes in response to signals from the nervous system and hormones, ensuring that chyme is released into the small intestine in controlled amounts to optimize digestion and prevent overloading.

Step 5: Confirm that the correct answer is the pyloric sphincter, as it is the specific structure responsible for controlling the flow of chyme from the stomach to the small intestine.