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 majority of the lever systems in the arms and legs are third-class levers; there are few second-class levers. Knowing this which of the following statements is correct?

The muscles of the arms and legs usually work at a mechanical disadvantage.

These joints will have relatively small range of motion.

Most movements of the arms and legs prioritize power over speed.

The fulcrum will most often be placed between the effort and the load.

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Verified step by step guidance

Understand the types of levers: In anatomy, levers are classified into three types based on the arrangement of the fulcrum, effort, and load. Third-class levers have the effort applied between the fulcrum and the load.

Identify the characteristics of third-class levers: Third-class levers are known for providing a mechanical disadvantage, meaning they require more effort to move a load but allow for greater speed and range of motion.

Analyze the statement about mechanical disadvantage: Since third-class levers are prevalent in the arms and legs, the muscles in these areas often work at a mechanical disadvantage, prioritizing speed and range of motion over power.

Evaluate the range of motion: Third-class levers typically allow for a larger range of motion, contrary to the statement that these joints will have a relatively small range of motion.

Consider the placement of the fulcrum: In third-class levers, the fulcrum is not placed between the effort and the load; this arrangement is characteristic of first-class levers.