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 are primarily recruited during short, explosive activities such as sprinting?

Type IIb fast-twitch fibers

Type IIa intermediate fibers

Cardiac muscle fibers

Type I slow-twitch fibers

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Verified step by step guidance

Understand the types of muscle fibers: There are three main types of skeletal muscle fibers—Type I (slow-twitch), Type IIa (intermediate fast-twitch), and Type IIb (fast-twitch). Each type has unique characteristics suited for different activities.

Analyze the activity described: Short, explosive activities like sprinting require rapid and powerful muscle contractions. These activities rely on anaerobic energy systems and generate high force in a short time.

Match the muscle fiber type to the activity: Type IIb fast-twitch fibers are specialized for quick, powerful bursts of activity. They have a high contraction speed and force production but fatigue quickly due to their reliance on anaerobic metabolism.

Eliminate incorrect options: Type I slow-twitch fibers are designed for endurance and are not suited for explosive activities. Type IIa fibers are intermediate and can support both endurance and power but are not as specialized for explosive activities as Type IIb fibers. Cardiac muscle fibers are found in the heart and are not involved in skeletal muscle movement.

Conclude that Type IIb fast-twitch fibers are the primary muscle fibers recruited during short, explosive activities like sprinting, as they are optimized for high power and speed.