Physiology Question?

Question

I am working on a worksheet with some true/false questions and I was not sure of the answer. Here is the questions?? True or False

Renal blood flow is determined by using clearance of PAH?

The external urethral sphincter is controlled in an involuntary manner by the sympathetic system?

The renal clearance is the rate at which a substance is cleared from the blood?

Answer 1

True

False- (parasympathetic controlled)

False - (renal clearance is the volume of plasma from which a substance is completely removed by the kidney in a given amount of time.)☺

Check out this link:
http://en.wikipedia.org/wiki/Renal_clearance