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

Platelets: Hemostasis

Anatomy & Physiology

17. The Blood

Platelets: Hemostasis

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Multiple Choice

Which of the following most accurately describes a platelet plug?

A temporary aggregation of platelets that forms at the site of a blood vessel injury to prevent blood loss.

A chemical signal that initiates the clotting cascade.

A permanent structure that replaces damaged blood vessel walls.

A collection of red blood cells that seals a wound.

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Verified step by step guidance

Understand the role of platelets in hemostasis: Platelets are small cell fragments in the blood that play a crucial role in stopping bleeding by forming a plug at the site of blood vessel injury.

Identify the process of platelet plug formation: When a blood vessel is injured, platelets adhere to the exposed collagen fibers of the damaged vessel wall, becoming activated and releasing chemical signals.

Recognize the temporary nature of a platelet plug: The platelet plug is a temporary aggregation of platelets that forms quickly to prevent blood loss, but it is not a permanent solution.

Differentiate between platelet plug and clotting cascade: The platelet plug formation is an initial response, while the clotting cascade involves a series of chemical reactions that stabilize the plug by forming a fibrin clot.

Clarify misconceptions: A platelet plug is not a permanent structure, nor does it involve red blood cells. It is specifically the aggregation of platelets at the injury site.