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

In a physiological system operating with positive feedback, which of the following best describes the response to a stimulus?

The system returns rapidly to its set point.

The response amplifies the original stimulus.

The response counteracts the original stimulus.

The response is unrelated to the original stimulus.

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Verified step by step guidance

Step 1: Begin by understanding the concept of positive feedback in physiology. Positive feedback is a mechanism where the response to a stimulus amplifies or enhances the original stimulus, rather than counteracting it.

Step 2: Compare positive feedback to negative feedback. Negative feedback works to restore homeostasis by counteracting the original stimulus and returning the system to its set point. Positive feedback, on the other hand, moves the system further away from the set point.

Step 3: Identify examples of positive feedback in the body to reinforce understanding. For instance, during childbirth, the release of oxytocin causes uterine contractions, which in turn stimulate more oxytocin release, amplifying the process until delivery occurs.

Step 4: Analyze the options provided in the problem. Eliminate choices that describe negative feedback (e.g., 'The system returns rapidly to its set point' and 'The response counteracts the original stimulus') or unrelated responses (e.g., 'The response is unrelated to the original stimulus').

Step 5: Select the option that aligns with the definition of positive feedback: 'The response amplifies the original stimulus.' This matches the physiological mechanism described in Step 1.