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 the following statements is true about infections?

Infections can be caused by bacteria, viruses, fungi, or parasites.

Infections are always caused by bacteria.

Infections only occur in the respiratory system.

Infections are always beneficial to the host organism.

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Verified step by step guidance

Begin by understanding the definition of an infection. An infection occurs when a foreign organism enters a host's body and causes harm or disease.

Identify the types of organisms that can cause infections. These include bacteria, viruses, fungi, and parasites. Each type has distinct characteristics and modes of transmission.

Evaluate the statement that infections are always caused by bacteria. Consider the fact that viruses, fungi, and parasites can also cause infections, making this statement false.

Consider the statement that infections only occur in the respiratory system. Infections can occur in various parts of the body, such as the skin, gastrointestinal tract, and urinary tract, not just the respiratory system.

Assess the statement that infections are always beneficial to the host organism. Infections typically harm the host by causing disease or discomfort, so this statement is incorrect.