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 skeletal muscle fiber is most important for an athlete running a 40 meter sprint?

Slow oxidative fibers (Type I)

Fast glycolytic fibers (Type IIb)

Cardiac muscle fibers

Fast oxidative-glycolytic fibers (Type IIa)

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Verified step by step guidance

Understand the types of skeletal muscle fibers: Skeletal muscle fibers are categorized into three main types based on their contraction speed, energy source, and fatigue resistance: Slow oxidative fibers (Type I), Fast oxidative-glycolytic fibers (Type IIa), and Fast glycolytic fibers (Type IIb).

Analyze the activity: A 40-meter sprint is a short-duration, high-intensity activity that requires rapid bursts of energy. This type of activity relies on anaerobic metabolism and fast muscle contractions.

Match the muscle fiber type to the activity: Fast glycolytic fibers (Type IIb) are specialized for short, explosive movements. They contract quickly, generate high force, and rely on anaerobic glycolysis for energy, making them ideal for sprinting.

Compare other muscle fiber types: Slow oxidative fibers (Type I) are designed for endurance activities and rely on aerobic metabolism, making them unsuitable for a sprint. Fast oxidative-glycolytic fibers (Type IIa) are intermediate fibers that support both aerobic and anaerobic activities but are less specialized for explosive movements compared to Type IIb fibers.

Conclude the reasoning: Based on the characteristics of the muscle fiber types and the demands of a 40-meter sprint, Fast glycolytic fibers (Type IIb) are the most important for this activity.