Summary Mastering Biology notes on Chapter 44 Animal Excretory Systems
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Course
BIO13 (BIO13)
Institution
University College Utrecht (UCU)
This document includes: kidneys, water conservation, osmolarity, ADH, aldosterone, nephron, urine, passive and active transport, loop of Henle, collecting duct, filtration, reabsorption, secretion, excretion, etc.
Kidneys: maintain water and electrolyte balance
Antidiuretic hormone (ADH), aldosterone, and atrial natriuretic peptide (ANP) regulate
kidney function
Parts of the kidney
Conserve water by concentrating urine
- Osmolarity of blood 300 mOsm/L
- Osmolarity of urine 1,200 mOsm/L
Osmolarity: concentration of urine. Large value = concentrated, small value = dilute
ADH secretion, inadequate water intake, eating salty food, sweating => increases water
reabsorption
Aldosterone release, diarrhea, blood loss => increases Na+ and therefore water reabsorption
Diabetes insipidus, alcohol, caffeine => no increase in Na+ and water reabsorption
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