EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 51, Problem 2Q
Summary Introduction
To review:
Whether animals with a higher percentage of long loops of Henle are more capable of producing concentrated urine or not.
Given:
The percentage of long loops of Henle and the freezing point depression (FPD) of different mammals are given in the Table 1.
Table 1: Percentage long loops of Henle and FPD of different mammals.
Animal | Percent long loops of Henle | FPD (ᵒC) |
Beaver | 0 | 0.96 |
Pig | 3 | 2 |
Human | 14 | 2.6 |
Dog | 100 | 4.85 |
Cat | 100 | 5.8 |
Lab rat | 28 | 4.85 |
Kangaroo rat | 27 | 10.4 |
Jerboa | 33 | 12 |
Sand rat | 100 | 9.2 |
Introduction:
FPD is a test which is used to measure the concentration of urine. It is known that fresh water freezes at 0°C, but the addition of solutes lowers this freezing temperature.
The medulla of the kidney has two types of loops of Henle-long and short. The long loops of Henle extend the entire length of the medulla while the short ones do not.
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Chapter 51 Solutions
EBK LIFE: THE SCIENCE OF BIOLOGY
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