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Homeostasis is the maintenance of a stable internal environment (A-level only)

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Question 12

The loop of Henle is a specialized structure in the nephrons of mammalian kidneys that helps conserve water.

a.

Explain how a longer loop of Henle allows desert mammals to survive with limited access to drinking water.

[2]
b.

Scientists found that the relationship between the maximum urine concentration in mOsmol kg−1\text{mOsmol kg}^{-1}mOsmol kg−1 (yyy) and the relative medullary thickness (xxx) of different mammalian species can be approximated by the equation:

y=320x+180 y = 320x + 180 y=320x+180

Calculate the relative medullary thickness of a species of desert rodent that produces a maximum urine concentration of 2900 mOsmol kg−12900\text{ mOsmol kg}^{-1}2900 mOsmol kg−1. Show your working.

[2]

Homeostasis is the maintenance of a stable internal environment (A-level only) Questions

  1. A Level
  2. /Biology
  3. /Homeostasis is the maintenance of a stable internal environment (A-level only)