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 fiber enables Frances to stand for hours during her job as a nurse?

Fast glycolytic (Type IIb) fibers

Fast oxidative (Type IIa) fibers

Slow oxidative (Type I) fibers

Cardiac muscle fibers

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Verified step by step guidance

Understand the function of each muscle fiber type: Slow oxidative (Type I) fibers are specialized for endurance activities and prolonged contractions due to their high mitochondrial content and reliance on aerobic metabolism. Fast glycolytic (Type IIb) fibers are designed for short bursts of power and rely on anaerobic metabolism. Fast oxidative (Type IIa) fibers are intermediate, capable of both endurance and power. Cardiac muscle fibers are specific to the heart and are not involved in skeletal muscle function.

Identify the activity described in the problem: Frances is standing for hours during her job as a nurse, which requires sustained muscle contraction and endurance rather than short bursts of power.

Match the activity to the appropriate muscle fiber type: Since standing for long periods relies on endurance, the muscle fibers involved must be slow oxidative (Type I) fibers, which are fatigue-resistant and rely on aerobic metabolism.

Consider the physiological characteristics of slow oxidative fibers: These fibers have a high density of mitochondria, myoglobin, and capillaries, which support prolonged activity by efficiently producing ATP through aerobic respiration.

Conclude that slow oxidative (Type I) fibers are the correct type of muscle fibers enabling Frances to stand for hours, as they are specifically adapted for endurance and sustained contraction.