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

When a skeletal muscle fiber is at rest, its ATP demands are met by which of the following processes?

Direct phosphorylation of ADP by creatine phosphate

Aerobic metabolism of fatty acids

Anaerobic glycolysis

Fermentation of glucose

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Verified step by step guidance

Understand the energy demands of skeletal muscle fibers at rest: At rest, skeletal muscle fibers have low energy demands compared to during exercise. This means the muscle primarily relies on efficient and sustainable energy production methods.

Review the process of aerobic metabolism: Aerobic metabolism occurs in the mitochondria and uses oxygen to break down substrates like fatty acids and glucose to produce ATP. This process is highly efficient and produces a large amount of ATP per molecule of substrate.

Compare aerobic metabolism to other processes: Direct phosphorylation of ADP by creatine phosphate is a quick but short-term energy source used during high-intensity activity. Anaerobic glycolysis and fermentation of glucose are less efficient and primarily used during periods of oxygen deficit, such as intense exercise.

Identify the primary substrate used at rest: Fatty acids are the preferred substrate for aerobic metabolism during rest because they provide a steady and abundant energy source without depleting glucose reserves.

Conclude that aerobic metabolism of fatty acids is the primary process meeting ATP demands at rest: This process ensures a sustainable and efficient energy supply for the muscle fiber's low activity level.