NBME Step 1 form 3 doubts...

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NBME Step 1 Form 3 Block 3


Q 17. The P50 is defined as the partial pressure of oxygen.....
Q33. A 30 year old man develops cold cyanotic fingers whil walking his dog on a cold night......
Q39. After eating, a 40 year old woman has a vague feeling of discomfort in the right upper quadrant...
Q49. As a part of a study to determine factors influencing mortality in an intensive care unit.....




I need the correct answer with explanation please.. Anyone?


Thanks in advance...