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 one of the following describes a positive feedback loop?

A mechanism that always results in a return to the set point after a disturbance.

A process in which the response counteracts the original stimulus to maintain homeostasis.

A process in which the response amplifies the original stimulus, leading to an even greater response.

A system that prevents any change from occurring in the internal environment.

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Verified step by step guidance

Step 1: Understand the concept of feedback loops in physiology. Feedback loops are mechanisms used by the body to regulate internal conditions and maintain homeostasis. They can be categorized as either positive or negative feedback loops.

Step 2: Define a positive feedback loop. A positive feedback loop is a process in which the response to a stimulus amplifies or enhances the original stimulus, leading to an even greater response. This is in contrast to negative feedback loops, which counteract the stimulus to return to a set point.

Step 3: Identify examples of positive feedback loops in the body. Common examples include the release of oxytocin during childbirth, which intensifies uterine contractions, and the blood clotting cascade, where activated platelets amplify the clotting process.

Step 4: Analyze the options provided in the problem. Compare each description to the definition of a positive feedback loop. Eliminate options that describe negative feedback loops or mechanisms unrelated to amplification of the original stimulus.

Step 5: Select the correct answer based on the definition of a positive feedback loop. The correct description is: 'A process in which the response amplifies the original stimulus, leading to an even greater response.'