Excretion as an example of homeostatic control

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Question 10
Medium

The diagram below shows the structure of a single nephron.

A diagram of a single mammalian nephron. The afferent arteriole leads into a capillary network labeled A (which is enclosed by Bowman's capsule). The fluid then flows into a highly coiled region close to A, labeled B. The tubule then loops down into the medulla as the Loop of Henle, before coiling again in a region labeled C. Region C connects to a large straight vertical tube labeled D. A large arrow on the left points downwards, indicating an increasing concentration of solutes in the interstitial fluid from the cortex to the deep medulla.

a.

Complete the table below by matching the correct letter or letters (AAA, BBB, CCC, or DDD) of the nephron to each statement.

StatementLetter(s)
Active reabsorption of all filtered glucose and amino acids occurs here
Permeability to water is increased by the action of antidiuretic hormone (ADH)
Ultrafiltration occurs here due to high hydrostatic pressure
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b.

Outline the physiological processes occurring in the ascending and descending limbs of the loop of Henle that establish the concentration gradient shown by the downward-pointing arrow.

[5]

Excretion as an example of homeostatic control Questions

  1. A Level
  2. /Biology
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