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 Heart2h 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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following substances is responsible for limiting a platelet plug to the immediate area of damage?

thromboxane A₂

serotonin

adenosine diphosphate

prostacyclin

Previous problemNext problem

Verified step by step guidance

Understand the role of platelet plugs in hemostasis: Platelet plugs are crucial for stopping bleeding by forming a temporary seal at the site of blood vessel injury.

Identify the substances involved in platelet plug formation: Thromboxane A2, serotonin, and adenosine diphosphate (ADP) are all involved in promoting platelet aggregation and vasoconstriction.

Recognize the function of prostacyclin: Prostacyclin is a substance produced by the endothelial cells lining blood vessels. It acts as a vasodilator and inhibits platelet aggregation, thus preventing the spread of the platelet plug beyond the site of injury.

Consider the balance between pro-aggregatory and anti-aggregatory factors: While thromboxane A2, serotonin, and ADP promote platelet aggregation, prostacyclin serves to limit this aggregation to the area of damage.

Conclude that prostacyclin is responsible for limiting the platelet plug to the immediate area of damage by counteracting the effects of the other substances involved in platelet aggregation.