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

Which of the following is the best example of a negative feedback mechanism in homeostasis?

The increase in heart rate during exercise to supply more oxygen

The clotting of blood to prevent excessive bleeding

The release of insulin to lower blood glucose levels

The release of oxytocin during childbirth to increase contractions

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Verified step by step guidance

Understand the concept of homeostasis: Homeostasis is the body's ability to maintain a stable internal environment despite changes in external conditions. Negative feedback mechanisms are processes that counteract changes, bringing the system back to its set point.

Identify the characteristics of negative feedback: Negative feedback mechanisms work to reverse a change in a controlled condition. When a variable deviates from its normal range, negative feedback mechanisms activate to bring it back to the desired level.

Analyze each example: Consider how each example functions in the body. The increase in heart rate during exercise is a response to increased demand for oxygen, not a reversal of a change. Blood clotting is a positive feedback mechanism, as it amplifies the response to injury.

Focus on insulin release: The release of insulin in response to high blood glucose levels is a classic example of negative feedback. Insulin helps lower blood glucose levels, counteracting the initial increase and restoring balance.

Consider oxytocin release: The release of oxytocin during childbirth is a positive feedback mechanism, as it enhances contractions to facilitate delivery, rather than reversing a change.