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

1. Introduction to Anatomy & Physiology

Feedback Loops

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Feedback Loops

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Multiple Choice

What is the main difference between negative and positive feedback in physiological systems?

Negative feedback reverses a change to maintain homeostasis, while positive feedback amplifies a change.

Negative feedback only occurs during disease, while positive feedback occurs during health.

Negative feedback amplifies a change, while positive feedback reverses a change.

Both negative and positive feedback always disrupt homeostasis.

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Verified step by step guidance

Understand the concept of feedback mechanisms in physiology: Feedback mechanisms are processes that help maintain homeostasis by regulating physiological functions. They are categorized into negative feedback and positive feedback.

Define negative feedback: Negative feedback is a mechanism that reverses a change in a physiological system to bring it back to its set point or normal range. For example, if body temperature rises, negative feedback mechanisms work to lower it back to normal.

Define positive feedback: Positive feedback amplifies or enhances a change in a physiological system, moving it further away from the set point. This mechanism is less common and typically occurs in specific situations, such as during childbirth (oxytocin release) or blood clotting.

Compare the two mechanisms: Negative feedback works to restore balance and maintain homeostasis by counteracting changes, while positive feedback temporarily disrupts homeostasis to achieve a specific physiological goal. Negative feedback is more common in maintaining health, whereas positive feedback is often involved in processes requiring rapid or amplified responses.

Analyze the options provided: Based on the definitions and comparisons, identify the correct statement. Negative feedback reverses a change to maintain homeostasis, while positive feedback amplifies a change. The other options are incorrect because they misrepresent the roles of feedback mechanisms in physiological systems.