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

Secretion of which hormone is controlled by a positive-feedback mechanism?

Parathyroid hormone

Oxytocin

Cortisol

Insulin

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Verified step by step guidance

Understand the concept of positive feedback mechanisms: Positive feedback amplifies a response or process, rather than stabilizing it. In physiology, this mechanism is less common compared to negative feedback.

Identify the role of oxytocin: Oxytocin is a hormone primarily involved in childbirth and lactation. During labor, oxytocin stimulates uterine contractions, and these contractions further stimulate the release of more oxytocin, creating a positive feedback loop.

Compare with other hormones: Parathyroid hormone, cortisol, and insulin are regulated by negative feedback mechanisms. For example, insulin secretion decreases blood glucose levels, and once glucose levels are normalized, insulin secretion is reduced.

Relate oxytocin to its physiological context: During childbirth, the stretching of the cervix triggers oxytocin release, which intensifies uterine contractions. This process continues until the baby is delivered, demonstrating a positive feedback loop.

Conclude why oxytocin fits the description: Oxytocin is the only hormone in the list controlled by a positive feedback mechanism, as its secretion is amplified during specific physiological events like labor and breastfeeding.