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BIO 140 Human Biology I - Questions and Solutions

The Urinary System and Homeostasis - Solutions

Review Questions

1. Which step in vitamin D production does the kidney perform?

  1. converts cholecalciferol into calcidiol
  2. converts calcidiol into calcitriol
  3. stores vitamin D
  4. none of these

2. Which hormone does the kidney produce that stimulates red blood cell production?

  1. thrombopoeitin
  2. vitamin D
  3. EPO
  4. renin

3. If there were no aquaporin channels in the collecting duct, ________.

  1. you would develop systemic edema
  2. you would retain excess Na+
  3. you would lose vitamins and electrolytes
  4. you would suffer severe dehydration

 

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Critical Thinking Questions

1. How does lack of protein in the blood cause edema?

Solution: Protein has osmotic properties. If there is not enough protein in the blood, water will be attracted to the interstitial space and the cell cytoplasm resulting in tissue edema.

2. Which three electrolytes are most closely regulated by the kidney?

Solution: The three electrolytes are most closely regulated by the kidney are calcium, sodium, and potassium.

 

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OpenStax, The Urinary System and Homeostasis. OpenStax CNX. Jul 8, 2013 http://cnx.org/contents/42de4ee5-b6d3-49e9-8c36-18ba1bbd15bc@6. © Jul 8, 2013 OpenStax. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License 3.0 license.