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 muscle fiber type has the highest shortening velocity?

Fast oxidative fibers (Type IIa)

Slow oxidative fibers (Type I)

Cardiac muscle fibers

Fast glycolytic fibers (Type IIb)

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Verified step by step guidance

Understand the concept of muscle fiber types: Muscle fibers are categorized based on their contraction speed, metabolic pathways, and fatigue resistance. The main types are Type I (slow oxidative), Type IIa (fast oxidative), and Type IIb (fast glycolytic). Cardiac muscle fibers are specialized for continuous rhythmic contractions and are not classified in the same way as skeletal muscle fibers.

Review the characteristics of Type IIb (fast glycolytic) fibers: These fibers are designed for rapid, powerful contractions and rely primarily on anaerobic metabolism. They have the highest shortening velocity due to their fast myosin ATPase activity and ability to generate force quickly.

Compare shortening velocities: Type I fibers (slow oxidative) have the lowest shortening velocity because they are adapted for endurance and rely on aerobic metabolism. Type IIa fibers (fast oxidative) have intermediate shortening velocity, combining both aerobic and anaerobic metabolism. Type IIb fibers (fast glycolytic) have the highest shortening velocity, optimized for short bursts of intense activity.

Exclude cardiac muscle fibers: Cardiac muscle fibers are specialized for rhythmic contractions and are not directly comparable to skeletal muscle fibers in terms of shortening velocity. They are designed for endurance and continuous activity rather than rapid shortening.

Conclude that Type IIb (fast glycolytic) fibers have the highest shortening velocity: This is due to their fast myosin ATPase activity and reliance on anaerobic metabolism, which supports rapid and powerful contractions.