Table of contents

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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

10. Muscles

Muscle Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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Multiple Choice

Which muscle is responsible for closing the lips?

Masseter

Orbicularis oris

Zygomaticus major

Buccinator

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Verified step by step guidance

Begin by identifying the primary function of each muscle listed in the options. Understanding the function will help determine which muscle is responsible for closing the lips.

The Masseter muscle is primarily involved in the action of chewing, as it elevates the mandible. It is not responsible for lip movement.

The Zygomaticus major muscle is responsible for elevating the corners of the mouth, contributing to smiling. It does not close the lips.

The Buccinator muscle is involved in compressing the cheek, aiding in actions like blowing and chewing, but it does not directly close the lips.

The Orbicularis oris muscle encircles the mouth and is responsible for closing the lips. It acts as a sphincter to purse the lips and is involved in actions such as speaking and kissing.