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

Why is the process of birthing a baby considered an example of positive feedback?

It maintains homeostasis by counteracting changes in the body.

It involves a series of events that amplify the initial stimulus.

It decreases the intensity of uterine contractions over time.

It relies on a negative feedback mechanism to regulate hormone levels.

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Verified step by step guidance

Understand the concept of feedback mechanisms: Feedback mechanisms are processes that help maintain homeostasis in the body. They can be either negative or positive.

Define positive feedback: Positive feedback amplifies or increases the change or output, leading to an enhanced response. It moves the system away from its initial state.

Identify the role of positive feedback in childbirth: During childbirth, the initial stimulus is the contraction of the uterus. Positive feedback amplifies these contractions, leading to stronger and more frequent contractions.

Explain the amplification process: The hormone oxytocin is released in response to uterine contractions, which further stimulates more contractions. This cycle continues, amplifying the initial stimulus until the baby is born.

Contrast with negative feedback: Unlike negative feedback, which works to counteract changes and maintain stability, positive feedback in childbirth enhances the process to achieve a specific outcome, which is the delivery of the baby.