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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

Types of Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Types of Muscle Tissue

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Multiple Choice

Which of the following best describes slow-twitch muscle fibers?

They primarily rely on anaerobic metabolism for energy.

They contain fewer mitochondria and less myoglobin than fast-twitch fibers.

They generate quick, powerful contractions but fatigue rapidly.

They are highly resistant to fatigue and are used for endurance activities.

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Verified step by step guidance

Understand the characteristics of slow-twitch muscle fibers: Slow-twitch fibers, also known as Type I fibers, are designed for endurance and continuous, extended muscle contractions over a long time.

Recognize the energy metabolism: Slow-twitch fibers primarily rely on aerobic metabolism, which means they use oxygen to generate energy efficiently over prolonged periods.

Identify the structural features: These fibers have a high density of mitochondria, which are the powerhouses of the cell, providing the necessary energy for sustained activity.

Consider the role of myoglobin: Slow-twitch fibers contain a high amount of myoglobin, a protein that binds oxygen, facilitating its availability for aerobic metabolism.

Relate to functional characteristics: Due to their high resistance to fatigue, slow-twitch fibers are predominantly used in endurance activities such as long-distance running, cycling, and swimming.