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 Innate Immunity

Anatomy & Physiology

21. The Immune System

Introduction to Innate Immunity

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Multiple Choice

Which of the following best describes the innate immune system?

A defense mechanism that requires prior exposure to a pathogen to be effective.

A system that relies on the production of antibodies to target specific pathogens.

A highly specific defense mechanism that adapts and improves its response over time.

A non-specific defense mechanism that acts immediately or within hours of an antigen's appearance in the body.

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Verified step by step guidance

Understand the concept of the innate immune system: It is the body's first line of defense against pathogens and is non-specific, meaning it does not target specific pathogens but rather provides a general defense.

Recognize that the innate immune system acts quickly: It responds immediately or within hours of an antigen's appearance, unlike the adaptive immune system which takes longer to respond.

Differentiate between innate and adaptive immunity: The adaptive immune system is specific and relies on prior exposure to pathogens to develop a targeted response, often involving antibodies.

Identify key components of the innate immune system: These include physical barriers like skin, chemical barriers like stomach acid, and cells such as phagocytes that engulf pathogens.

Conclude that the innate immune system is a non-specific defense mechanism: It does not require prior exposure to a pathogen and acts rapidly to protect the body from infection.