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

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which of the following types of skeletal muscle fibers is specialized for endurance?

Fast oxidative fibers (Type IIa)

Fast glycolytic fibers (Type IIb)

Intermediate fibers

Slow oxidative fibers (Type I)

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Verified step by step guidance

Understand the characteristics of skeletal muscle fiber types: Skeletal muscle fibers are categorized based on their contraction speed and metabolic properties. The main types are slow oxidative fibers (Type I), fast oxidative fibers (Type IIa), and fast glycolytic fibers (Type IIb).

Recognize the specialization of slow oxidative fibers (Type I): These fibers are adapted for endurance activities due to their high mitochondrial density, abundant myoglobin content, and reliance on aerobic metabolism for energy production.

Compare slow oxidative fibers to other types: Fast oxidative fibers (Type IIa) are faster but less fatigue-resistant than Type I fibers, while fast glycolytic fibers (Type IIb) are specialized for short bursts of power and rely on anaerobic metabolism, making them less suited for endurance.

Understand the role of myoglobin and mitochondria: Slow oxidative fibers contain high levels of myoglobin, which stores oxygen, and numerous mitochondria, which facilitate sustained aerobic energy production during prolonged activities.

Conclude that slow oxidative fibers (Type I) are the correct answer: Their structural and functional adaptations make them ideal for endurance tasks, such as maintaining posture or long-distance running.