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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.

13. Respiratory control centers are located in the ________.        

16. Which of the following female structures is homologous to the male scrotum?