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

25. The Urinary System

Introduction to the Urinary System

Anatomy & Physiology

25. The Urinary System

Introduction to the Urinary System

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Multiple Choice

Which sphincter is under voluntary control in the human body?

Lower esophageal sphincter

Internal anal sphincter

Pyloric sphincter

External anal sphincter

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Verified step by step guidance

Understand the role of sphincters in the human body: Sphincters are circular muscles that control the passage of substances through an opening or tube, such as the digestive tract.

Differentiate between voluntary and involuntary control: Voluntary control involves conscious control over muscle movements, typically involving skeletal muscles, while involuntary control is managed by smooth muscles and the autonomic nervous system.

Identify the location and function of each sphincter mentioned: The lower esophageal sphincter prevents acid reflux from the stomach to the esophagus, the internal anal sphincter helps maintain continence, and the pyloric sphincter regulates the passage of food from the stomach to the small intestine.

Recognize that the external anal sphincter is composed of skeletal muscle, which is under voluntary control, allowing conscious regulation of defecation.

Conclude that the external anal sphincter is the only sphincter among the options provided that is under voluntary control, distinguishing it from the others which are controlled involuntarily.