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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which organ system is primarily responsible for fighting off infections in the human body?

Skeletal system

Immune system

Digestive system

Muscular system

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Verified step by step guidance

Step 1: Begin by identifying the primary function of each organ system listed in the problem. For example, the skeletal system provides structural support and protection, the digestive system processes food and absorbs nutrients, and the muscular system enables movement.

Step 2: Recall the role of the immune system in the human body. The immune system is responsible for defending the body against pathogens such as bacteria, viruses, and other harmful microorganisms.

Step 3: Understand the components of the immune system, which include white blood cells (leukocytes), lymph nodes, the spleen, thymus, and bone marrow. These work together to detect and eliminate infections.

Step 4: Compare the functions of the immune system with the other systems listed in the problem. The immune system is the only one directly involved in fighting off infections.

Step 5: Conclude that the immune system is the correct answer based on its specialized role in protecting the body from infections and maintaining overall health.