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Homeostasis, an animal's maintenance of certain internal [#permalink]
26 Jan 2005, 04:22
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Homeostasis, an animal’s maintenance of certain internal variables within an acceptable range, particularly in extreme physical environments, has long interested biologists. The desert rat and the camel in the most water-deprived environments, and marine vertebrates in an all-water environment, encounter the same regulatory problem: maintaining adequate internal fluid balance.
For desert rats and camels, the problem is conservation of water in an environment where standing water is nonexistent, temperature is high, and humidity is low. Despite these handicaps, desert rats are able to maintain the osmotic pressure of their blood, as well as their total body water content, at approximately the same levels as other rats. One countermeasure is behavioral: these rats stay in burrows during the hot part of the day,thus avoiding loss of fluid through panting or sweating, which are regulatory mechanisms for maintaining internal body temperature by evaporative cooling. Also, desert rats’ kidneys can excrete a urine having twice as high a salt content as seawater.
Camels, on the other hand, rely more on simple endurance. They cannot store water, and their reliance on an entirely unexceptional kidney results in a rate of water loss through renal function significantly higher than that of desert rats. As a result, camels must tolerate losses in body water of up to 30 percent of their body weight. Nevertheless, camels do rely on a special mechanism to keep water loss within a tolerable range: by sweating and panting only when their body temperature exceeds that which would kill a human, they conserve internal water.
Marine vertebrates experience difficulty with their water balance because though there is no shortage of seawater to drink, they must drink a lot of it to maintain their internal fluid balance. But the excess salts from the seawater must be discharged somehow, and the kidneys of most marine vertebrates are unable to excrete a urine in which the salts are more concentrated than in seawater. Most of these animals have special salt-secreting organs outside the kidney that enable them to eliminate excess salt.
Questions 24–26 refer to the passage above.
24. Which of the following most accurately states the purpose of the passage?
(A) To compare two different approaches to the study of homeostasis (B) To summarize the fi ndings of several studies regarding organisms’ maintenance of internal variables in extreme environments (C) To argue for a particular hypothesis regarding various organisms’ conservation of water in desert environments (D) To cite examples of how homeostasis is achieved by various organisms (E) To defend a new theory regarding the maintenance of adequate fl uid balance
24.A Examples of homeostasis are given, but diff erent approaches to studying it are not discussed. B The passage describes examples, but it does not summarize studies. C While the passage does discuss two desert animals, it does not present any argument for a particular hypothesis. D Correct. The passage discusses the examples of desert rats, camels, and marine vertebrates to show how these organisms are able to achieve homeostasis. E The passage describes how three organisms maintain water balance, but it presents no theory about it. The correct answer is D
. 25. It can be inferred from the passage that some mechanisms that regulate internal body temperature, like sweating and panting, can lead to which of the following?
(A) A rise in the external body temperature (B) A drop in the body’s internal fluid level (C) A decrease in the osmotic pressure of the blood (D) A decrease in the amount of renal water loss (E) A decrease in the urine’s salt content
25. A Since a contrast is drawn between the kidneys of camels and those of desert rats, the two must function differently; the passage makes no reference to the kidneys of other rats. B Correct. The camel’s kidney does nothing special to help the camel cope with its difficult environment. C No comparison between the kidneys of camels and the kidneys of marine vertebrates is made. D There is no information given about the kidney structure of most mammals in desert environments so this conclusion is not justified. E Marine vertebrates have other organs that help eliminate extra salt; camels do not. The correct answer is B.
26. It can be inferred from the passage that the author characterizes the camel’s kidney as “entirely unexceptional” (line 26) primarily to emphasize that it
(A) functions much as the kidney of a rat functions (B) does not aid the camel in coping with the exceptional water loss resulting from the extreme conditions of its environment (C) does not enable the camel to excrete as much salt as do the kidneys of marine vertebrates (D) is similar in structure to the kidneys of most mammals living in water-deprived environments (E) requires the help of other organs in eliminating excess salt OA& OE
26. A Since a contrast is drawn between the kidneys of camels and those of desert rats, the two must function diff erently; the passage makes no reference to the kidneys of other rats. B Correct. The camel’s kidney does nothing special to help the camel cope with its difficult environment. C No comparison between the kidneys of camels and the kidneys of marine vertebrates is made. D There is no information given about the kidney structure of most mammals in desert environments so this conclusion is not justified. E Marine vertebrates have other organs that help eliminate extra salt; camels do not. The correct answer is B.
Last edited by daagh on 22 Oct 2013, 04:13, edited 4 times in total.