6. Nasal conchae heat and moisten inhaled air, and reclaim heat and moisture during exhalation.

43. Which body system of a pregnant woman undergoes the most dramatic physiological changes during pregnancy?        

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 ________.        

49. Angina pectoris is thoracic pain caused by a fleeting deficiency in blood delivery to the myocardium, with resulting decreased oxygen being delivered to the cells. Because nitroglycerin acts as a vasodilator (similar to nitric oxide), blood flow is increased, promoting the delivery of oxygen to the cells

39. This disease is the most common lethal genetic disease in North America with symptoms such as abnormal, viscous mucus that clogs the passageways, leading to possible bacterial infections.

9. The oral contraceptive pill, informally called “the pill,” contains an estrogen and progesterone, or a synthetic mimic of this hormone. The combination of these two hormones, taken in the pill and circulating in the blood, works because ________.        

20. All veins carry deoxygenated blood.

23. Which male hormone provides negative feedback for the secretion of FSH?        

44. The correct sequence of preembryonic structures is ________.        

13. Respiratory control centers are located in the ________.