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

Bleeding is normally stopped by which of the following processes?

Phagocytosis

Antibody production

Hemostasis

Inflammation

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Verified step by step guidance

Step 1: Understand the term 'Hemostasis'—it refers to the physiological process by which bleeding is stopped after an injury to a blood vessel.

Step 2: Break down the stages of Hemostasis: (1) Vascular spasm, (2) Platelet plug formation, and (3) Coagulation (blood clotting). Each stage plays a critical role in stopping bleeding.

Step 3: Vascular spasm occurs immediately after a blood vessel is injured. The smooth muscle in the vessel wall contracts to reduce blood flow to the area.

Step 4: Platelet plug formation involves platelets adhering to the exposed collagen fibers of the damaged vessel. Platelets release chemicals that attract more platelets, forming a temporary plug.

Step 5: Coagulation is the final stage, where a series of clotting factors activate to convert fibrinogen into fibrin. Fibrin forms a mesh that stabilizes the platelet plug and creates a durable clot to stop bleeding.