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A 74-year-old male is brought to the ER with diarrhea and vomiting. The symptoms started 24 hours ago and he has been unable to take much fluid during this period of time. His mucous membranes are dry and his blood pressure is 90/60 mmHg. Which of the following changes in renal plasma flow (RPF), glomerular filtration rate (GFR) and filtration fraction (FF) do you expect most in this patient?
A. RPF ↓↓, GFR ↓, FF ↑
B. RPF ↓↓, GFR ↓, FF ↓
C. RPF ↓↓, GFR ↑, FF ↓
D. RPF ↓, GFR ↑, FF ↑
E. RPF ↑, GFR ↑, FF ↓

can someone please explain it to me. answer is A but how acc to my knowledge efferent arteriole constriction causes inc gfr and inc ff and dec rpf..
 
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