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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

What is the primary function of macrophages in the immune system?

They engulf and digest cellular debris and pathogens.

They produce antibodies to neutralize pathogens.

They release histamine to initiate inflammation.

They activate T-cells by presenting antigens.

Previous problemNext problem

Verified step by step guidance

Understand the role of macrophages in the immune system: Macrophages are a type of white blood cell that play a crucial role in the body's defense mechanism.

Identify the process of phagocytosis: Macrophages engulf and digest cellular debris, foreign substances, microbes, and cancer cells in a process known as phagocytosis.

Differentiate between macrophages and other immune cells: Unlike B-cells that produce antibodies or mast cells that release histamine, macrophages primarily focus on engulfing and digesting pathogens.

Recognize the role of macrophages in antigen presentation: After digesting pathogens, macrophages present antigens on their surface to activate T-cells, which is a secondary function.

Conclude the primary function: The main function of macrophages is to engulf and digest cellular debris and pathogens, which is essential for maintaining tissue homeostasis and initiating immune responses.