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 event initiates the intrinsic pathway of coagulation?

Exposure of blood to tissue factor

Activation of factor XII by contact with collagen

Release of platelet-derived growth factor

Conversion of fibrinogen to fibrin

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Verified step by step guidance

Understand the intrinsic pathway of coagulation: It is one of the two pathways that lead to the formation of a blood clot, the other being the extrinsic pathway. The intrinsic pathway is initiated by damage to the blood vessel itself.

Identify the key event that initiates the intrinsic pathway: The intrinsic pathway begins when blood comes into contact with collagen exposed by damage to the blood vessel wall.

Recognize the role of factor XII: Factor XII, also known as Hageman factor, is activated when it comes into contact with collagen. This activation is the first step in the intrinsic pathway.

Differentiate between intrinsic and extrinsic pathways: The intrinsic pathway is activated by internal trauma to the vascular system, whereas the extrinsic pathway is initiated by external trauma that causes blood to escape from the vessel.

Connect the activation of factor XII to the coagulation cascade: Once factor XII is activated, it sets off a series of reactions involving other clotting factors, ultimately leading to the conversion of fibrinogen to fibrin, forming a stable blood clot.