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 best describes slow-twitch muscle fibers?

They rely primarily on anaerobic metabolism for energy.

They have low myoglobin content and few mitochondria.

They contract rapidly and generate powerful, short bursts of strength.

They are resistant to fatigue and specialized for endurance activities.

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Verified step by step guidance

Understand the characteristics of slow-twitch muscle fibers: These fibers are specialized for endurance activities and are resistant to fatigue. They rely primarily on aerobic metabolism, which requires oxygen, to generate energy efficiently over long periods.

Recognize the role of myoglobin in slow-twitch muscle fibers: Myoglobin is a protein that stores oxygen in muscle cells. Slow-twitch fibers have high myoglobin content, which supports their reliance on aerobic metabolism.

Identify the presence of mitochondria in slow-twitch muscle fibers: Mitochondria are the organelles responsible for aerobic energy production. Slow-twitch fibers contain numerous mitochondria to sustain prolonged activity.

Contrast slow-twitch fibers with fast-twitch fibers: Fast-twitch fibers are designed for short bursts of strength and rely on anaerobic metabolism, which does not require oxygen. They have lower myoglobin content and fewer mitochondria compared to slow-twitch fibers.

Conclude that slow-twitch muscle fibers are resistant to fatigue and specialized for endurance activities, making them ideal for sustained, low-intensity exercises like long-distance running or cycling.