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 processes is an example of a negative feedback loop in the human body?

Blood clotting during injury

Regulation of blood glucose levels by insulin

Production of melanin in response to UV exposure

Release of oxytocin during childbirth

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Verified step by step guidance

Understand the concept of a negative feedback loop: It is a process that counteracts a change in a physiological variable by initiating responses that will bring the variable back to its set point or normal range.

Identify the processes mentioned in the problem: Blood clotting during injury, regulation of blood glucose levels by insulin, production of melanin in response to UV exposure, and release of oxytocin during childbirth.

Analyze each process: Blood clotting is a positive feedback loop because it amplifies the response to injury. Melanin production increases in response to UV exposure, which is not a feedback loop. Oxytocin release during childbirth is a positive feedback loop as it enhances contractions.

Focus on the regulation of blood glucose levels by insulin: When blood glucose levels rise, insulin is released to lower glucose levels, and when glucose levels fall, insulin secretion decreases. This is a classic example of a negative feedback loop.

Conclude that the regulation of blood glucose levels by insulin is the correct example of a negative feedback loop, as it works to maintain homeostasis by reversing the direction of change in blood glucose levels.