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

17. The Blood

Introduction To Blood

Anatomy & Physiology

17. The Blood

Introduction To Blood

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Multiple Choice

What initiates the extrinsic mechanism of coagulation?

Platelet activation

Calcium ion release

Tissue factor released by damaged tissues

Conversion of fibrinogen to fibrin

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Verified step by step guidance

Understand the coagulation process: Coagulation is the process by which blood forms clots. It involves a series of steps that lead to the conversion of fibrinogen, a soluble plasma protein, into fibrin, an insoluble protein that forms the meshwork of a clot.

Differentiate between intrinsic and extrinsic pathways: The coagulation cascade can be initiated by two pathways - intrinsic and extrinsic. The intrinsic pathway is activated by trauma inside the vascular system, while the extrinsic pathway is activated by external trauma that causes blood to escape from the vascular system.

Identify the role of tissue factor: The extrinsic pathway is initiated by the release of tissue factor (also known as factor III or thromboplastin) from damaged tissues. Tissue factor is a protein that is exposed when tissues are injured, and it interacts with factor VII in the blood to start the coagulation cascade.

Consider the role of calcium ions: Calcium ions are crucial for various steps in the coagulation cascade, including the activation of certain clotting factors. However, they do not initiate the extrinsic pathway.

Recognize the conversion of fibrinogen to fibrin: This conversion is a key step in the formation of a stable clot, but it occurs later in the coagulation process, after the cascade has been initiated by tissue factor.