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

The pectoralis major is an ______ of the arm.

abductor

flexor

extensor

adductor

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Verified step by step guidance

Step 1: Understand the function of the pectoralis major muscle. The pectoralis major is a large, fan-shaped muscle located in the chest. Its primary function is to move the arm at the shoulder joint.

Step 2: Review the definitions of the terms provided in the options: 'abductor,' 'flexor,' 'extensor,' and 'adductor.' For example: - Abductor: A muscle that moves a limb away from the midline of the body. - Flexor: A muscle that decreases the angle between two bones at a joint. - Extensor: A muscle that increases the angle between two bones at a joint. - Adductor: A muscle that moves a limb toward the midline of the body.

Step 3: Analyze the movement produced by the pectoralis major. This muscle is responsible for actions such as flexion, adduction, and medial rotation of the arm at the shoulder joint.

Step 4: Match the correct term to the primary action of the pectoralis major. Since the muscle contributes to moving the arm closer to the midline of the body, the term 'adductor' is relevant. Additionally, it assists in flexion of the arm, making 'flexor' another correct term.

Step 5: Conclude that the pectoralis major can be described as both a flexor and an adductor of the arm, based on its anatomical function and the options provided.