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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

Which of the following is a characteristic of a type II muscle fiber?

Primarily uses aerobic metabolism

Fast contraction speed

Rich in myoglobin

High resistance to fatigue

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Verified step by step guidance

Understand the characteristics of muscle fiber types: Type I (slow-twitch) and Type II (fast-twitch). Type I fibers are associated with endurance activities, relying on aerobic metabolism, rich in myoglobin, and have high resistance to fatigue. Type II fibers are designed for short bursts of power and speed, relying more on anaerobic metabolism, and have faster contraction speeds.

Analyze the options provided in the question. The characteristics listed include: 'Primarily uses aerobic metabolism,' 'Fast contraction speed,' 'Rich in myoglobin,' and 'High resistance to fatigue.'

Compare each characteristic to the known traits of Type II muscle fibers. Type II fibers are known for fast contraction speed, lower myoglobin content compared to Type I fibers, reliance on anaerobic metabolism, and lower resistance to fatigue.

Eliminate the options that align more closely with Type I muscle fibers. For example, 'Primarily uses aerobic metabolism,' 'Rich in myoglobin,' and 'High resistance to fatigue' are traits of Type I fibers, not Type II fibers.

Identify the correct characteristic of Type II muscle fibers from the remaining options. Based on the comparison, 'Fast contraction speed' is the defining trait of Type II muscle fibers.