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15. Fertilization generally occurs in the ________.        

49. A urine test reveals a positive result for human chorionic gonadotropin (hCG). This indicates ________ was successful.        

44. The correct sequence of preembryonic structures is ________.        

11. The ability of sperm cells to move along the ductus deferens is due to ________.        

11. Possible causes of hypoxia include ________.        

14. The structures that receive the ovulated oocyte, providing a site for fertilization, are called the ________.          

19. Secretion of progesterone stimulates ________.        

47. Which hormone is NOT produced by the placenta?    

17. Which of the following is NOT true regarding fenestrated capillaries?        

20. All veins carry deoxygenated blood.