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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which of the following is the main factor that determines the power of a muscle?

The type of joint the muscle crosses

The length of the muscle at rest

The number of muscle fibers contracting

The amount of myoglobin in the muscle

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Verified step by step guidance

Understand the concept of muscle power: Muscle power is determined by the ability of the muscle to generate force during contraction. This is influenced by the number of muscle fibers actively contracting.

Review the anatomy of a muscle: Muscles are composed of bundles of muscle fibers. Each fiber contains contractile proteins (actin and myosin) that generate force when stimulated.

Analyze the options provided: The type of joint the muscle crosses, the length of the muscle at rest, and the amount of myoglobin in the muscle are factors that influence muscle function but are not the primary determinant of muscle power.

Focus on the correct factor: The number of muscle fibers contracting directly correlates with the muscle's ability to generate force. More fibers contracting simultaneously result in greater power output.

Conclude the reasoning: The correct answer is 'The number of muscle fibers contracting' because it is the main factor that determines the power of a muscle during contraction.