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: Negative Feedback

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Feedback Loops: Negative Feedback

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Multiple Choice

Why are the insulin and glucagon feedback loops considered examples of negative feedback loops?

They work to amplify changes in blood glucose levels.

They are activated only during periods of fasting.

They maintain homeostasis by reversing deviations from normal blood glucose levels.

They involve the release of hormones that increase blood glucose levels only.

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Verified step by step guidance

Understand the concept of negative feedback loops: Negative feedback loops are mechanisms that counteract changes in a system to maintain stability or homeostasis. They work by reversing deviations from a set point.

Identify the role of insulin and glucagon: Insulin and glucagon are hormones that regulate blood glucose levels. Insulin decreases blood glucose levels, while glucagon increases them.

Analyze how insulin and glucagon function in feedback loops: When blood glucose levels rise, insulin is released to lower them, bringing the levels back to normal. Conversely, when blood glucose levels drop, glucagon is released to raise them, again restoring normal levels.

Relate the actions of insulin and glucagon to negative feedback: Both hormones act to reverse changes in blood glucose levels, which is characteristic of negative feedback. They do not amplify changes but instead work to stabilize the system.

Conclude why these loops are considered negative feedback: Insulin and glucagon maintain homeostasis by reversing deviations from normal blood glucose levels, which is the defining feature of negative feedback loops.