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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: Positive Feedback

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Feedback Loops: Positive Feedback

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Multiple Choice

Ori overhears his study partners discussing a feedback loop where Substance M is released, and the more Substance M is released the more is generated. They note that humans don't release Substance M all the time, only when the pathway is activated. What type of feedback loop is this and why?

Negative feedback because it's the most common.

Negative feedback because the process is returning the body to the set point.

Positive feedback because the amount of the substance is increasing.

Positive feedback because the process increasingly moves away from the starting condition.

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Verified step by step guidance

Identify the key characteristics of the feedback loop described: Substance M is released, and its release leads to more of it being generated.

Understand the definition of a positive feedback loop: In positive feedback, the output of a system acts to enhance or amplify changes, moving the system further away from its starting condition.

Contrast this with negative feedback, where the output of a system acts to reduce or dampen changes, helping to maintain stability or return to a set point.

Apply these definitions to the scenario: Since the release of Substance M leads to more of it being generated, this indicates an amplification of the process, characteristic of positive feedback.

Conclude that the feedback loop is positive because the process increasingly moves away from the starting condition, rather than returning to a set point.