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

Types of Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Types of Muscle Tissue

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Multiple Choice

Marathon runners rely on which muscle fiber type for endurance?

Type I fibers (slow-twitch)

Type IIb fibers (fast-twitch glycolytic)

Type IIa fibers (fast-twitch oxidative)

Type III fibers (intermediate)

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Verified step by step guidance

Understand the different types of muscle fibers: Type I fibers are slow-twitch fibers that are highly efficient at using oxygen to generate more ATP for continuous, extended muscle contractions over a long time. Type II fibers are fast-twitch fibers that are better suited for short bursts of strength or speed.

Recognize the characteristics of Type I fibers: These fibers have a high density of mitochondria, myoglobin, and capillaries, which support aerobic metabolism and endurance activities.

Identify the role of Type II fibers: Type IIa fibers are fast-twitch oxidative fibers that can use both aerobic and anaerobic metabolism, while Type IIb fibers are fast-twitch glycolytic fibers that primarily rely on anaerobic metabolism for short, intense activities.

Consider the demands of marathon running: Marathon running requires sustained energy and endurance over a long period, which aligns with the capabilities of Type I fibers.

Conclude that Type I fibers are most suitable for marathon runners due to their endurance capabilities and efficient use of oxygen for prolonged activities.