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

5. Integumentary System

Introduction to the Integumentary System

Anatomy & Physiology

5. Integumentary System

Introduction to the Integumentary System

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Multiple Choice

Which muscle is responsible for controlling the eyebrows by drawing them in and downward?

Orbicularis oculi

Zygomaticus major

Frontalis

Corrugator supercilii

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Verified step by step guidance

Step 1: Begin by identifying the function of each muscle listed in the problem. The Orbicularis oculi is responsible for closing the eyelids and is not involved in eyebrow movement.

Step 2: Examine the Zygomaticus major. This muscle is primarily involved in facial expressions, such as smiling, by elevating the corners of the mouth. It does not control eyebrow movement.

Step 3: Consider the Frontalis muscle. This muscle is part of the epicranius and is responsible for raising the eyebrows and wrinkling the forehead, but it does not draw the eyebrows downward.

Step 4: Focus on the Corrugator supercilii muscle. This small muscle is located near the medial end of the eyebrows and is responsible for drawing the eyebrows downward and inward, creating vertical wrinkles above the nose.

Step 5: Conclude that the Corrugator supercilii is the correct answer based on its specific function of controlling the eyebrows by drawing them in and downward.