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 of the following hormones is regulated by a positive feedback mechanism?

Insulin

Cortisol

Thyroxine

Oxytocin

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Verified step by step guidance

Understand the concept of feedback mechanisms: Feedback mechanisms are processes that regulate hormone levels in the body. They can be either negative or positive. Negative feedback mechanisms work to maintain homeostasis by reducing the output or activity of any organ or system back to its normal range. Positive feedback mechanisms, on the other hand, amplify the response and increase the output.

Identify the hormones listed: Insulin, Cortisol, Thyroxine, and Oxytocin. Each of these hormones has specific roles and regulatory mechanisms in the body.

Examine the regulatory mechanism of each hormone: Insulin is regulated by negative feedback to control blood glucose levels. Cortisol is regulated by negative feedback involving the hypothalamus and pituitary gland. Thyroxine is regulated by negative feedback through the hypothalamic-pituitary-thyroid axis.

Focus on Oxytocin: Oxytocin is unique among the listed hormones because it is regulated by a positive feedback mechanism. During childbirth, oxytocin stimulates uterine contractions, which in turn stimulate the release of more oxytocin, further increasing contractions.

Conclude with the understanding of positive feedback in Oxytocin: The positive feedback loop in oxytocin is crucial for the progression of labor and delivery, making it the correct answer to the question.