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23. The left ventricular wall of the heart is thicker than the right wall in order to ________.        

27. The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ________.        

36. Which of the following arises in the bronchial epithelium? 

25. Which of the disorders below is characterized by the destruction of the walls of the alveoli producing abnormally large air spaces that remain filled with air during exhalation by decreasing the lung’s elasticity?        

15.  The left lung differs from the right in that the left lung has ________.        

40. The corpus luteum prevents loss of the implanted embryo through menstruation by secreting ________.        

31. Implantation begins six to seven days after ovulation.

46. Intercalated discs contain anchoring desmosomes that prevent cell separation, and gap junctions that allow ions to travel from cell to cell enabling greater communication by increasing the surface area, transmitting current across the entire heart. The fibrous cardiac skeleton acts as a tendon, an insertion and insulator, giving the cardiac cells something to pull or exert their force on and isolating atrial from ventricular contractions

15. Fertilization generally occurs in the ________.        

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