Continuity and Change D.9 Homeostasis (id: 6cce06917)

本题目来源于试卷: Continuity and Change D.9 Homeostasis，类别为 IB生物学

[单选题]
This diagram shows the basi- .usi +gmr1emc structure of a nephi xip:u9i,e34k 9 ykfhpe7t7m ron.


How does the nephron differ between animals that have evolved in areas with low availability of water, for example, in the desert?

A. Larger surface area in glomerulus
B. Higher density of capillaries in glomerulus
C. Shorter proximal convoluted tubule
D. Longer loop of Henle


参考答案:  D


本题详细解析:

Choice D is correct because animals that have evolved in environments where they need to conserve water have longer loops of Henle for increased reabsorption of water.

Choice A is incorrect because a larger surface area in the glomerulus would lead to increased water concentration in the filtrate.

Choice B is incorrect because a greater number of capillaries in the glomerulus would lead to more water being filtered out into the urine.

Choice C is incorrect because a shorter proximal convoluted tubule would reduce the reabsorption of water and other substances.

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