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

21. The Immune System

Introduction to First-Line Defenses

Anatomy & Physiology

21. The Immune System

Introduction to First-Line Defenses

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Multiple Choice

Which of the following is a primary mechanism by which the body maintains homeostasis?

Positive feedback loops

Negative feedback loops

Increased metabolic rate

Voluntary muscle contractions

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Verified step by step guidance

Understand the concept of homeostasis: Homeostasis refers to the body's ability to maintain a stable internal environment despite changes in external conditions.

Identify the mechanisms involved in homeostasis: The body uses various mechanisms to regulate internal conditions, including feedback loops.

Differentiate between positive and negative feedback loops: Positive feedback loops amplify changes and are less common in maintaining homeostasis, while negative feedback loops counteract changes to return the body to a set point.

Recognize the role of negative feedback loops: Negative feedback loops are the primary mechanism for maintaining homeostasis. They work by detecting deviations from a set point and initiating responses to correct them.

Consider examples of negative feedback loops: Common examples include the regulation of body temperature, blood glucose levels, and blood pressure, where sensors detect changes and effectors restore balance.