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 is true of positive feedback mechanisms?

They amplify the initial stimulus.

They are more common than negative feedback mechanisms in the body.

They help maintain homeostasis by counteracting changes.

They typically involve a decrease in the original stimulus.

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Verified step by step guidance

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

Define positive feedback: Positive feedback mechanisms amplify or increase the initial stimulus, leading to an enhanced response. This is in contrast to negative feedback, which works to reduce or counteract the stimulus.

Identify examples of positive feedback: Common examples include the process of childbirth, where the release of oxytocin increases contractions, and blood clotting, where the presence of a clotting factor leads to the production of more clotting factors.

Compare positive and negative feedback: Negative feedback mechanisms are more common in the body and are crucial for maintaining homeostasis by counteracting changes. Positive feedback is less common and typically does not maintain homeostasis.

Evaluate the statements: The statement 'They amplify the initial stimulus' is true for positive feedback mechanisms, while the other statements are characteristics of negative feedback mechanisms or incorrect descriptions of positive feedback.