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

10. Muscles

Levers

Anatomy & Physiology

10. Muscles

Levers

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Multiple Choice

The most common lever in the human body is the __________.

third-class lever

fourth-class lever

first-class lever

second-class lever

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Verified step by step guidance

Understand the concept of levers in the human body: Levers are simple machines that consist of a rigid structure (like a bone) that rotates around a fixed point called the fulcrum. In the human body, muscles provide the force to move the lever, and the load is the resistance being moved.

Learn the classification of levers: Levers are classified into three types based on the arrangement of the fulcrum, effort (force), and load (resistance). These are first-class, second-class, and third-class levers.

Review the characteristics of each lever type: First-class levers have the fulcrum between the effort and the load (e.g., nodding the head). Second-class levers have the load between the fulcrum and the effort (e.g., standing on tiptoes). Third-class levers have the effort between the fulcrum and the load (e.g., flexing the forearm).

Identify the most common lever in the human body: Third-class levers are the most common type in the human body. They allow for greater speed and range of motion, which is essential for many movements like flexing the elbow or lifting objects.

Match the correct answer to the question: Based on the explanation above, the most common lever in the human body is the third-class lever. This matches the correct answer provided in the question.