Principles of Life for the AP Course (2nd Edition)

Published by W. J. Freeman
ISBN 10: 1464156417
ISBN 13: 978-1-46415-641-0

Chapter 36 - Section 36.5 - Kidneys Adjust Water Excretion to Help Animals Maintain Homeostasis - Apply The Concept - Page 761: 1


1. The glomerular filteration rate is 1mm/minute. This is the rate in which the primary urine is formed by all nephrons function collectively. 2. The PAH is secreted. This is because urine has a higher concentration of PAH, with 5.85 mg/ml. This is in comparison to the plasma which is 0.01 mg/ml. 3. NA+ is reaborbed because it has a higher concentration in the blood plasma. NA+ concentration is 140 mEg/L, but urine has 70 mEg/L.

Work Step by Step

1, 1mm/min is the primary urine rate. 2. If the substance has a higher concentration in the urine than in the plasma membrane it is secretion. 3, If the substance has a higher concentration in the plasma membrane than in the urine it is absorbed.
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