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 Heart2h 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

Glucagon is a hormone that is released by the pancreas in response to falling blood glucose levels. The release of glucagon is part of a negative feedback mechanism. Based on that information, what effect would you expect glucagon to have on the body?

Glucagon signals the liver to break down glycogen and release the resulting glucose into the bloodstream.

Glucagon signals the liver to stop all glycogen breakdown and synthesis to try to maintain glucose levels.

Glucagon signals the liver to remove glucose from the bloodstream and store it as glycogen.

Glucagon signals the small intestine to reduce absorption of glucose into the blood.

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Verified step by step guidance

Understand the role of glucagon: Glucagon is a hormone produced by the alpha cells of the pancreas. It plays a crucial role in maintaining blood glucose levels, especially during fasting or between meals.

Identify the mechanism: Glucagon is part of a negative feedback mechanism. This means that it acts to counteract changes in blood glucose levels, specifically when they fall below a certain threshold.

Determine the target organ: Glucagon primarily targets the liver, which is the main storage site for glycogen, a stored form of glucose.

Analyze the liver's response: When glucagon signals the liver, it stimulates the breakdown of glycogen into glucose, a process known as glycogenolysis. This increases the amount of glucose released into the bloodstream.

Conclude the effect: Given the role of glucagon in raising blood glucose levels, the expected effect is that glucagon signals the liver to break down glycogen and release glucose into the bloodstream, thereby increasing blood glucose levels.