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 Heart2h 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

Origin and Insertion

Anatomy & Physiology

10. Muscles

Origin and Insertion

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Multiple Choice

The most common lever systems in the body are those that have the applied force between the fulcrum and the resistance. These are called __________ levers.

third-class

first-class

second-class

fifth-class

fourth-class

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Verified step by step guidance

Understand the concept of levers in the human body: Levers are simple machines that help in movement and are classified based on the relative positions of the fulcrum, effort (applied force), and load (resistance).

Identify the three classes of levers: First-class levers have the fulcrum between the effort and the load, second-class levers have the load between the fulcrum and the effort, and third-class levers have the effort between the fulcrum and the load.

Recognize that in the human body, third-class levers are the most common. In these levers, the applied force is between the fulcrum and the resistance, which allows for greater speed and range of motion.

Consider examples of third-class levers in the body: The biceps brachii muscle acting on the forearm is a classic example, where the elbow joint acts as the fulcrum, the biceps apply the force, and the weight of the forearm and hand is the resistance.

Conclude that the correct answer to the problem is 'third-class levers' as they are the most common lever systems in the body with the applied force between the fulcrum and the resistance.