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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

  • 6
  • 3
  • 2
  • 9

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

  • True
  • False

11. Platelets age quickly and last around _____ days if they aren't involved in clotting

  • 10
  • 120
  • 45
  • 2

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