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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Problem 13

Textbook Question

More than one choice may apply.
Place the letters of these events in the order they occur during hemostasis.

Verified step by step guidance

Step 1: Understand the concept of hemostasis, which is the process by which the body stops bleeding and repairs damaged blood vessels. It involves three main stages: vascular spasm, platelet plug formation, and coagulation.

Step 2: Review the events listed (a, b, c, d) and identify which stage of hemostasis each event corresponds to. For example, vascular spasm involves the constriction of blood vessels, platelet plug formation involves the aggregation of platelets, and coagulation involves the formation of a fibrin clot.

Step 3: Place the events in chronological order based on the sequence of hemostasis. Start with vascular spasm, followed by platelet plug formation, and then coagulation.

Step 4: If multiple events occur within the same stage, determine their sub-order based on the physiological process. For example, platelet adhesion occurs before platelet aggregation during platelet plug formation.

Step 5: Double-check the order to ensure it aligns with the physiological sequence of hemostasis and confirm that all events are accounted for in the correct order.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Hemostasis

Hemostasis is the process that prevents and stops bleeding, or hemorrhage. It involves a complex interaction between blood vessels, platelets, and various proteins in the blood, leading to the formation of a stable blood clot. Understanding the stages of hemostasis is crucial for identifying the correct sequence of events in the multiple-choice question.

Stages of Hemostasis

Hemostasis occurs in three main stages: vascular spasm, platelet plug formation, and coagulation. Vascular spasm is the immediate constriction of blood vessels to reduce blood flow. Platelet plug formation involves platelets adhering to the site of injury and aggregating to form a temporary seal, while coagulation involves a cascade of reactions that lead to the formation of a fibrin clot, stabilizing the platelet plug.

Coagulation Cascade

The coagulation cascade is a series of enzymatic reactions that lead to the conversion of fibrinogen into fibrin, which forms the meshwork of a blood clot. This cascade is divided into intrinsic and extrinsic pathways, both of which converge on a common pathway that ultimately results in clot formation. Understanding this cascade is essential for determining the correct order of events in hemostasis.