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 the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to the Immune System

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Multiple Choice

Which of these best explains the role of the immune system in protecting the body from pathogens?

The immune system primarily relies on the skin to prevent pathogens from entering the body.

The immune system uses red blood cells to engulf and digest pathogens.

The immune system produces hormones that directly kill pathogens.

The immune system identifies and destroys pathogens through a coordinated response involving various cells and proteins.

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Verified step by step guidance

Understand that the immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens such as bacteria, viruses, and other foreign invaders.

Recognize that the skin acts as a physical barrier to prevent pathogens from entering the body, but it is not the primary mechanism of the immune system's response.

Identify that red blood cells are primarily responsible for carrying oxygen and do not play a direct role in engulfing or digesting pathogens. This task is performed by white blood cells, such as phagocytes.

Acknowledge that the immune system does not produce hormones to directly kill pathogens. Instead, it uses a variety of cells and proteins, such as antibodies, to identify and neutralize pathogens.

Conclude that the immune system's role is to identify and destroy pathogens through a coordinated response involving various cells, such as lymphocytes, and proteins, such as antibodies, to effectively protect the body from infections.