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

3. Energy & Cell Processes

Introduction to Cellular Respiration

Anatomy & Physiology

3. Energy & Cell Processes

Introduction to Cellular Respiration

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Multiple Choice

Which statement about lactic acid in muscle fibers is true?

Lactic acid is stored in muscle fibers for long-term energy use.

Lactic acid is the primary source of energy for muscle contraction.

Lactic acid is produced during anaerobic respiration when oxygen levels are low.

Lactic acid accumulation in muscles leads to increased pH levels.

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Verified step by step guidance

Understand the context of lactic acid production: Lactic acid is produced in muscle fibers during anaerobic respiration, which occurs when oxygen levels are insufficient for aerobic respiration.

Recognize the role of lactic acid: It is not stored for long-term energy use nor is it the primary source of energy for muscle contraction. Instead, it is a byproduct of anaerobic metabolism.

Clarify the effects of lactic acid accumulation: Lactic acid accumulation in muscles actually leads to decreased pH levels, causing muscle fatigue and soreness, not increased pH levels.

Identify the correct statement: The correct statement is that lactic acid is produced during anaerobic respiration when oxygen levels are low.

Review the physiological implications: During intense exercise, muscles may rely on anaerobic respiration, leading to lactic acid buildup, which is eventually cleared from the muscles and converted back to pyruvate or glucose in the liver.