The loop of Henle is a specialized structure in the nephrons of mammalian kidneys that helps conserve water.
Explain how a longer loop of Henle allows desert mammals to survive with limited access to drinking water.
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+180Calculate 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.
Practise AQA A Level Biology Homeostasis is the maintenance of a stable internal environment (A-level only) with exam-style questions for A Level Biology. 21 questions covering Principles of homeostasis and negative feedback (A-level only), Control of blood glucose concentration (A-level only), and Control of blood water potential (A-level only), matched to the AQA A Level Biology (7402) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
