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

In the context of innate immunity, what is a primary pathogen?

An organism that can cause disease in a healthy host

An organism that is part of the normal flora

A microorganism that only causes disease in immunocompromised individuals

A pathogen that requires a vector for transmission

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Verified step by step guidance

Understand the concept of innate immunity: Innate immunity is the body's first line of defense against pathogens, providing a non-specific response to invading organisms.

Define a primary pathogen: A primary pathogen is an organism that can cause disease in a healthy host, meaning it does not require the host to be immunocompromised or have any pre-existing conditions to cause illness.

Differentiate between primary and opportunistic pathogens: Opportunistic pathogens typically cause disease only in hosts with weakened immune systems, whereas primary pathogens can infect healthy individuals.

Consider the role of normal flora: Normal flora are microorganisms that reside in the body without causing disease under normal circumstances. They are not considered primary pathogens.

Evaluate the need for a vector: Some pathogens require a vector, such as a mosquito, for transmission. This characteristic does not define a primary pathogen, as primary pathogens can directly infect a host without a vector.