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38. This is a common disorder characterized by the temporary cessation of breathing during sleep.

45. Why would O2 enter into a cell?

4. Tracheal obstruction is life-threatening.

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 ________.        

22. THINK:  Which of the following is an appropriate response to carbon monoxide (CO) poisoning? In other words, if the body has a large amount of CO what would be the best measure to take?

43. Which is the correct symbol for deoxyhemoglobin?

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?