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

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which sphincter operates under voluntary control in the human body?

Internal anal sphincter

Pyloric sphincter

External anal sphincter

Lower esophageal sphincter

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Verified step by step guidance

Understand the function of a sphincter: A sphincter is a circular muscle that constricts or dilates to regulate the passage of substances through an opening in the body.

Identify the location and function of each sphincter mentioned: The internal anal sphincter is located at the end of the rectum and is involuntary, the pyloric sphincter is between the stomach and small intestine and is involuntary, the external anal sphincter surrounds the anal canal and is voluntary, and the lower esophageal sphincter is at the junction of the esophagus and stomach and is involuntary.

Differentiate between voluntary and involuntary control: Voluntary control means the muscle can be consciously controlled, while involuntary control means it operates automatically without conscious thought.

Recognize that the external anal sphincter is under voluntary control: This sphincter allows for conscious control over defecation, distinguishing it from the other sphincters listed.

Conclude that the external anal sphincter is the correct answer as it is the only sphincter among the options that operates under voluntary control.