41. The wall of the ascending limb of the loop of Henle is impermeable to a. sod

Question

41. The wall of the ascending limb of the loop of Henle is impermeable to a. sodium. b. potassium. C. Chloride. d. water. 42. Which of the following is not an example of acclimitization? a. Shedding winter fur in summer b. Increasing sweat production during a vacation to a hot climate c. Kidney medulla thickness in mammals living in xeric Vs mesic environments d. Changes in gill ATPase abudance with water salinity 43. Which of the following phrases best describes homeostasis? a. the ability of the body to constantly change its internal environment b. the body's natural tendency to change its internal temperature based on its external temperature c. the relatively constant internal physical and chemical conditions that organisms maintain despite the external environment d. A and B

Explanation / Answer

41. The wall of ascending limb of the loop of Henle is impermeable to water; but is permeable to ions that cross by diffusion. Hence, the ions sodium, potassium and chloride will difuse whereas water will not. Therefore, your answer is (d).

42. Shedding winter fur in summer, increasing sweat production during a vacation to a hot climate, and changes in gill ATPase with water salinity are all examples of acclimatization and all these changes/ adaptations are temporary and go away when the external stimulus is removed. Whereas kidney medulla thickness in mammals living in xeric Vs mesic environment is a physical adaptation and is permanent. Therefore, your answer is (c).

43. We know that homeostasis is an organism's ability to keep a constant internal environment. Hence the phrase "the relatively constant internal physical and chemical conditions that organisms maintain despite the external environment" best describes homeostasis. Options A and B are actually opposite of homeostasis. Therefore, your answer is (c).

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