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 Energy

Anatomy & Physiology

3. Energy & Cell Processes

Introduction to Energy

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Multiple Choice

For how long can the aerobic energy system sustain a moderate level of physical activity?

Several hours

Less than 30 seconds

About 2 minutes

Only a few seconds

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Verified step by step guidance

Understand the aerobic energy system: The aerobic energy system is responsible for producing ATP (adenosine triphosphate) through the breakdown of glucose, fats, and sometimes proteins in the presence of oxygen. It is the primary energy system used during prolonged, moderate-intensity physical activity.

Compare the aerobic energy system to other energy systems: The anaerobic energy systems (ATP-PC system and glycolysis) are used for short bursts of high-intensity activity, lasting only seconds to a few minutes. The aerobic system, however, is designed for sustained activity over longer periods.

Analyze the role of oxygen: The aerobic energy system relies on a continuous supply of oxygen to produce ATP efficiently. This allows it to sustain activity for extended durations, unlike anaerobic systems that rely on limited energy stores and produce lactic acid as a byproduct.

Consider the duration of moderate activity: Moderate physical activity, such as jogging or cycling, typically uses the aerobic energy system because it does not require rapid bursts of energy. The system can sustain activity for several hours as long as oxygen and fuel sources (glucose and fats) are available.

Conclude based on physiological principles: Since the aerobic energy system is designed for endurance and relies on oxygen and abundant fuel sources, it can sustain moderate physical activity for several hours, making this the correct answer.