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6. Name the potent aggregating agent released by platelets that causes more platelets to stick and release their contents
- Adenosine diphosphate
- Seratonin
- Thromboxann A2
7. When platelets aggregate and stick together, which step in haemostasis is this?
- Platelet plug formation
- Vascular spasm
- Coagulation
8. There are ___ phases to coagulation
9. The series of reactions set in motion to stop bleeding after a blood vessel wall breaks
- Leukopoiesis
- Haematocrit
- Haemostasis
- Erythropoesis
10. Platelets are anucleate
11. Platelets age quickly and last around _____ days if they aren't involved in clotting
12. Vascular spasm can reduce blood loss for about ________ minutes
- 20 - 30
- 10 - 15
- 2 - 5
- 30 - 45
13. Which plasma protein stabilises bound platelets and collagen fibers?
- Von Willebrand factor
- Von Damme factor
14. When platelets adhere to collagen, they release chemical messengers including: _______, serotonin and thromboxane A2
- Adenosine phosphate
- Adenosine diphosphate
- Adenosine triphosphate
15. ____________ are essential for the clotting process that occurs when blood vessels are ruptured
- Erythrocytes
- Platelets
- Leukocytes
16. There are essentially three steps to haemostasis: vascular spasm, platelet plug formation and ___________
- Spectin adhesion
- Cytokinesis
- Coagulation
- Erythropoiesis
17. Coagulation reinforces platelet plug with __________ that act as glue
- Fibrin threats
- Collagen tubes
18. The megakaryoblast repeatedly mitoses but _________ does not occure, resulting in a stage IV megakaryocyte
- Cytokinesis
- Crossing over
19. Platelets are cytoplasmic fragments of larger cells called _________
- Monocytes
- Macrophages
- Megakaryocytes
- Macrocytes
20. Platlets are kept mobile but inactive by ________ and prostacyclin, which are secreted by endothelial cells lining the blood vessels
- Nitric oxide
- Spectrin
- Albumin