During a routine medical checkup. Candice, a 26-year old physiotherapy student, is surprised to hear that her blood pressure is 180/110. She also has a rumbling systolic and diastolic abdominal murmur...

During a routine medical checkup. Candice, a 26-year old physiotherapy student, is surprised to hear that her blood pressure is 180/110. She also has a rumbling systolic and diastolic abdominal murmur that is loudest at the mid-epigastric area. Her physician suspects renal artery stenosis. She orders an abdominal ultrasound and real artery arteriography, which confirm that Candace has a small right kidney and the distal part of her right renal artery is narrowed by more than 70%. Her physician prescribes diuretics and calcium channel blockers as temporary measures refers Candace to a cardiovascular surgeon.

a) How will diuretics and calcium channel blockers improve her hypertension and abdominal murmur?

b) Explain the connection between Candace's renal artery stenosis and her hypertension.