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 type of muscle fibers contain abundant mitochondria, high levels of myoglobin, and are typically red in color?

Intermediate fibers

Slow oxidative (Type I) fibers

Fast glycolytic (Type IIb) fibers

Fast oxidative-glycolytic (Type IIa) fibers

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Verified step by step guidance

Understand the characteristics of muscle fiber types: Muscle fibers are categorized based on their metabolic properties and functional roles. The key types are Slow Oxidative (Type I), Fast Oxidative-Glycolytic (Type IIa), and Fast Glycolytic (Type IIb).

Focus on the features described in the question: The muscle fibers in question are noted for abundant mitochondria, high levels of myoglobin, and a red color. These traits are associated with aerobic metabolism and endurance activities.

Recall the role of mitochondria and myoglobin: Mitochondria are organelles responsible for aerobic energy production, while myoglobin is a protein that binds oxygen, giving muscle fibers a red appearance. These features are prominent in fibers adapted for sustained, low-intensity activities.

Match the characteristics to the fiber type: Slow Oxidative (Type I) fibers are specialized for endurance and aerobic metabolism. They contain abundant mitochondria, high levels of myoglobin, and are red in color due to their oxygen-binding capacity.

Compare with other fiber types: Intermediate fibers (Type IIa) and Fast Glycolytic fibers (Type IIb) have different properties. Type IIa fibers are a mix of oxidative and glycolytic traits, while Type IIb fibers rely on anaerobic metabolism and are pale due to lower myoglobin content.