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: Positive Feedback

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Feedback Loops: Positive Feedback

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Multiple Choice

Which of the following is a good example of a positive feedback mechanism in the human body?

Regulation of blood glucose levels by insulin

The release of oxytocin during childbirth to intensify uterine contractions

Control of blood pressure by baroreceptors

Thermoregulation to maintain body temperature

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Verified step by step guidance

Step 1: Understand the concept of positive feedback mechanisms. Positive feedback amplifies a response or process in the body, rather than stabilizing it. It is less common than negative feedback and typically occurs in processes that need to be pushed to completion.

Step 2: Review the examples provided in the question. Identify which processes involve amplification of a response rather than stabilization. For instance, regulation of blood glucose levels by insulin and thermoregulation are examples of negative feedback mechanisms, as they aim to maintain homeostasis.

Step 3: Focus on the example of oxytocin release during childbirth. Oxytocin stimulates uterine contractions, and these contractions, in turn, signal the release of more oxytocin. This creates a cycle that intensifies the contractions until childbirth is complete, which is characteristic of positive feedback.

Step 4: Compare this to the other examples, such as control of blood pressure by baroreceptors. Baroreceptors work to stabilize blood pressure, which is a negative feedback mechanism, not positive feedback.

Step 5: Conclude that the release of oxytocin during childbirth is the correct example of a positive feedback mechanism, as it amplifies the process to achieve a specific outcome (childbirth).