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 Heart2h 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

Homeostasis

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Homeostasis

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following is true of positive feedback mechanisms?

The variable changes in a direction opposite to that of the initial change.

The result or response enhances the original stimulus, and the response is accelerated.

The output shuts off the original stimulus or reduces its intensity.

They mostly function to keep blood chemicals within narrow ranges.

Previous problemNext problem

Verified step by step guidance

Understand the concept of feedback mechanisms: Feedback mechanisms are processes that use the conditions of one component to regulate the function of the system. They are crucial in maintaining homeostasis in the body.

Differentiate between positive and negative feedback: Negative feedback mechanisms work to reduce the output or activity of any organ or system back to its normal range of functioning, while positive feedback mechanisms enhance or amplify changes.

Identify the characteristics of positive feedback: In positive feedback, the response to a stimulus is to increase the change or output. The system moves further away from the target of equilibrium, enhancing the original stimulus.

Analyze the given options: The correct statement about positive feedback is that the result or response enhances the original stimulus, and the response is accelerated. This is in contrast to negative feedback, which would reduce the intensity of the stimulus.

Apply the concept to physiological examples: Positive feedback is less common in the body but can be seen in processes like childbirth, where the release of oxytocin increases contractions, further stimulating more oxytocin release, thus accelerating the process.