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

8. Joints

Introduction to Joints

Anatomy & Physiology

8. Joints

Introduction to Joints

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Multiple Choice

Which of the following is an example of a special movement at a joint?

Extension of the knee

Abduction of the arm

Flexion of the elbow

Opposition of the thumb

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Verified step by step guidance

Understand the concept of special movements: Special movements are unique actions that occur at specific joints and are not part of the general categories of movement like flexion, extension, abduction, or adduction.

Review the definition of opposition: Opposition refers to the movement in which the thumb is brought across the palm to touch the tips of the fingers. This movement is unique to the thumb and is considered a special movement.

Compare opposition to other movements: Extension, abduction, and flexion are general movements that occur at various joints in the body, whereas opposition is specific to the thumb and is classified as a special movement.

Identify the anatomical structures involved in opposition: The thumb's opposition movement is facilitated by the saddle joint at the base of the thumb (carpometacarpal joint) and involves muscles such as the opponens pollicis.

Conclude why opposition is the correct answer: Opposition of the thumb is a special movement because it is unique to the thumb and allows humans to perform precise tasks like grasping objects, distinguishing it from general movements like extension, abduction, or flexion.