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

Of the various types of skeletal muscle fibers, which fibers experience fatigue sooner?

Cardiac muscle fibers

Fast oxidative fibers

Slow oxidative fibers

Fast glycolytic fibers

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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, metabolic pathways, and fatigue resistance: slow oxidative fibers, fast oxidative fibers, and fast glycolytic fibers.

Analyze the characteristics of fast glycolytic fibers: These fibers are designed for short bursts of intense activity. They rely primarily on anaerobic glycolysis for energy production, which generates ATP quickly but leads to the accumulation of lactic acid, causing fatigue sooner.

Compare fatigue resistance among the fiber types: Slow oxidative fibers are highly fatigue-resistant due to their reliance on aerobic respiration and abundant mitochondria. Fast oxidative fibers are intermediate in fatigue resistance, using both aerobic and anaerobic pathways. Fast glycolytic fibers fatigue the quickest due to their reliance on anaerobic metabolism.

Eliminate incorrect options: Cardiac muscle fibers are not skeletal muscle fibers and are highly fatigue-resistant due to their continuous aerobic metabolism. Slow oxidative fibers are also highly fatigue-resistant, making them incorrect choices.

Conclude with the correct answer: Fast glycolytic fibers experience fatigue sooner because they rely on anaerobic metabolism, which produces energy quickly but leads to rapid fatigue due to lactic acid buildup.