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

What is the body's immune response to an outside substance that is otherwise harmless called?

Pathogen attack

Allergic reaction

Autoimmune response

Inflammatory response

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Verified step by step guidance

Begin by understanding the key terms related to the immune system: 'pathogen attack', 'allergic reaction', 'autoimmune response', and 'inflammatory response'. Each term describes a different type of immune response.

A 'pathogen attack' refers to the body's defense against harmful microorganisms like bacteria, viruses, or fungi. This is not applicable to harmless substances.

An 'autoimmune response' occurs when the immune system mistakenly attacks the body's own cells, thinking they are foreign. This is not related to harmless external substances.

An 'inflammatory response' is a general reaction to injury or infection, characterized by redness, swelling, and pain. It can occur due to various triggers, but is not specific to harmless substances.

An 'allergic reaction' is the body's immune response to a harmless substance, such as pollen or certain foods, which the immune system mistakenly identifies as a threat. This is the correct term for the body's response to harmless external substances.