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 muscle of the pectoral girdle raises the arms and pulls the shoulders downward?

Pectoralis major

Deltoid

Serratus anterior

Trapezius

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Verified step by step guidance

Step 1: Begin by understanding the anatomy of the pectoral girdle, which includes muscles that connect the upper limb to the axial skeleton and facilitate movement of the arms and shoulders.

Step 2: Review the function of the trapezius muscle. The trapezius is a large, triangular muscle located in the upper back and neck region. It is responsible for several actions, including raising the arms, pulling the shoulders downward, and stabilizing the scapula.

Step 3: Compare the trapezius muscle's function with the other options provided: Pectoralis major (responsible for flexion, adduction, and medial rotation of the arm), Deltoid (responsible for abduction of the arm), and Serratus anterior (responsible for protraction and upward rotation of the scapula). None of these muscles perform the specific actions of raising the arms and pulling the shoulders downward.

Step 4: Confirm that the trapezius muscle is the correct answer based on its anatomical location and function, as it uniquely performs the actions described in the question.

Step 5: To solidify understanding, visualize the trapezius muscle's role in movements such as shrugging the shoulders or pulling them downward during activities like carrying heavy objects.