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Chapter (23): Circulation الفصل (23) : الإعارة
Chapter (23): Circulation

10. How do the vessels and blood of an open circulatory system differ from those of a closed circulatory system?
Answer: (23.1, Page 468)

11. What is the difference between the single circulation of fish and the double circulation of land vertebrates?
Answer: (23.2, Page 469)

12. A slight decrease in blood pH causes the pacemaker to speed up. What is the function of this control mechanism?
Answer: (23.5, Page 472)

13. Why is it important to be able to identify a person's risk of cardiovascular diseases?
Answer: (23.6, Page 473)

14. How does the structure of a capillary relate to its function?
Answer: (23.7, Page 474)

15. If blood pressure in the vein drops to zero, how is it that blood velocity increases as blood flows from venules to vein?
Answer: (23.8, Page 475)

16. For every white blood cell in normal human blood, there are about --------- to --------- red blood cells
Answer: (23.12, Page 479)

17. Why might increasing the number of red blood cells result in greater endurance and speed?
Answer: (23.13, Page 480)

18. What is role of platelet in blood clot formation?
Answer: (23.14, Page 481)