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 two circular rings of muscle act as gatekeepers for the stomach?

Ileocecal valve and cardiac sphincter

Lower esophageal sphincter and pyloric sphincter

Tricuspid valve and mitral valve

Anal sphincter and upper esophageal sphincter

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Verified step by step guidance

Step 1: Understand the anatomy of the stomach and its connection to surrounding structures. The stomach is part of the digestive system and has muscular rings (sphincters) that regulate the flow of food and prevent backflow.

Step 2: Identify the two key sphincters associated with the stomach. The lower esophageal sphincter (also called the cardiac sphincter) is located at the junction between the esophagus and the stomach, preventing acid reflux. The pyloric sphincter is located at the junction between the stomach and the small intestine, controlling the passage of partially digested food into the duodenum.

Step 3: Compare the options provided in the question. The ileocecal valve is located between the small intestine and large intestine, and the tricuspid and mitral valves are part of the heart, not the digestive system. The anal sphincter and upper esophageal sphincter are not directly related to the stomach's function.

Step 4: Eliminate incorrect options based on anatomical relevance. The correct answer must involve sphincters directly connected to the stomach, which are the lower esophageal sphincter and pyloric sphincter.

Step 5: Confirm the correct answer by reviewing the function of the lower esophageal sphincter (preventing acid reflux) and the pyloric sphincter (regulating food passage into the small intestine). These two sphincters act as gatekeepers for the stomach.