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

Heat-loss enhancing mechanisms do not include ________.

sweating

increased respiratory rate

dilation of skin blood vessels

vasoconstriction of cutaneous blood vessels

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Verified step by step guidance

Understand the concept of heat-loss mechanisms: Heat-loss mechanisms are physiological processes that help the body release excess heat to maintain a stable internal temperature. These mechanisms are part of thermoregulation, which is controlled by the hypothalamus.

Review the listed mechanisms: Sweating, increased respiratory rate, and dilation of skin blood vessels are all processes that enhance heat loss. Sweating allows heat to dissipate through evaporation, increased respiratory rate releases heat through exhalation, and dilation of skin blood vessels increases blood flow to the skin, promoting heat loss through radiation and convection.

Analyze the mechanism of vasoconstriction: Vasoconstriction of cutaneous blood vessels refers to the narrowing of blood vessels in the skin. This reduces blood flow to the skin, minimizing heat loss and conserving body heat. Therefore, vasoconstriction is a heat-conserving mechanism, not a heat-loss enhancing mechanism.

Compare vasoconstriction with the other mechanisms: Unlike sweating, increased respiratory rate, and dilation of skin blood vessels, vasoconstriction works to retain heat rather than release it. This makes it the correct answer to the question as it does not enhance heat loss.

Conclude the reasoning: Based on the physiological functions of each mechanism, vasoconstriction of cutaneous blood vessels is not a heat-loss enhancing mechanism, as it serves to conserve heat instead.